diff --git a/backend/README.md b/backend/README.md
new file mode 100644
index 00000000..ab2996a2
--- /dev/null
+++ b/backend/README.md
@@ -0,0 +1,36 @@
+# dcalc backend
+
+## Run
+
+```bash
+uv sync
+python main.py
+```
+
+## Test
+
+```bash
+uv run pytest -v
+```
+
+## Quality
+
+```bash
+uv run ruff check .
+```
+
+## Runtime Entry
+
+- `main.py`: FastAPI application and uvicorn entry.
+- `api/routes/calc.py`: `/api/calc` HTTP route.
+- `services/calc_service.py`: calculation orchestration.
+- `core/basic/character/`: character calculation implementation.
+- `core/basic/equipment.py`: equipment data models and compatibility access.
+- `core/basic/equipment_registry.py`: equipment version registry and cache.
+- `database/connect.py`: SQLite and Redis connections.
+
+## Compatibility Rules
+
+- Do not change `/calc` request and response contract without frontend migration approval.
+- Do not change frontendNew result data shape during backend refactors.
+- Keep Skill and Forge business formulas behavior-compatible unless a dedicated formula task says otherwise.
diff --git a/backend/api/routes/calc.py b/backend/api/routes/calc.py
index edf6b435..cbbaf704 100644
--- a/backend/api/routes/calc.py
+++ b/backend/api/routes/calc.py
@@ -2,7 +2,7 @@ from api.core.Gzip import register_gzip_request
 from fastapi import APIRouter, Body
 from api.core.Response import response
 from api.dp import AltersDep
-from core.basic.character import createCharacter
+from services.calc_service import calculate
 
 router = APIRouter()
 
@@ -11,5 +11,4 @@ register_gzip_request(router)
 
 @router.post('/calc')
 async def calc(state: AltersDep, config=Body(None)):
-    character = createCharacter(state.alter, state.equVersion)
-    return response(data=character.calc(config))
+    return response(data=calculate(state, config))
diff --git a/backend/config/main.py b/backend/config/main.py
index 695d1637..c735c7b8 100644
--- a/backend/config/main.py
+++ b/backend/config/main.py
@@ -19,7 +19,8 @@ class Config(BaseSettings):
     HELPER_ID: str = ''
 
     model_config = SettingsConfigDict(
-        env_file=('config/.env', 'config/.env.dev', 'config/.env.prod')
+        env_file=('config/.env', 'config/.env.dev', 'config/.env.prod'),
+        extra='ignore',
     )
 
 
diff --git a/backend/core/basic/character/calc_equip.py b/backend/core/basic/character/calc_equip.py
index 850277d8..98b2a38c 100644
--- a/backend/core/basic/character/calc_equip.py
+++ b/backend/core/basic/character/calc_equip.py
@@ -6,6 +6,8 @@ from core.basic.equipment import OathSuit, Suit, get_equipment
 from ..formula import 增幅计算, 强化技攻, 武器强化计算, 精通计算, 耳环计算, 左右计算, 锻造计算
 from ..roleinfo import CharacterEmblemInfo, CharacterEquipInfo, CharacterOathInfo, get_key_by_value
 from .base import CharacterBase
+from .config_view import CalcConfigView
+from .effect_apply import apply_uppercase_attrs
 
 
 @cache
@@ -162,8 +164,7 @@ class CalcEquipMixin(CharacterBase):
             # 如果存在誓约和套装是同一个套装
             # 则直接不执行原套装效果，执行誓约套装增强的效果
             oathEffect = oath_suit_by_suit_id.get(suit.suitId, None)
-            filtered_dict = {k: v for k, v in suit.__dict__.items() if k[0].isupper()}
-            self.SetStatus(**filtered_dict)
+            apply_uppercase_attrs(self, suit)
             if func is not None and oathEffect is None:
                 # print(f'套装 {suit.name} 生效')
                 func(self)
@@ -184,13 +185,11 @@ class CalcEquipMixin(CharacterBase):
                 skills = [x for x in oathSuit.skills if x.suitId == oathSuit.suitId]
                 skill = next((x for x in oathSuit.skills if str(x.skillId) == str(self.charOathSkillId)), None)
                 # 誓约套装效果生效
-                filtered_dict = {k: v for k, v in oathSuit.__dict__.items() if k[0].isupper()}
-                self.SetStatus(**filtered_dict)
+                apply_uppercase_attrs(self, oathSuit)
                 if skill is not None:
                     oathSkillEffect.append(skill)
                     # 誓约技能效果生效
-                    filtered_dict = {k: v for k, v in skill.__dict__.items() if k[0].isupper()}
-                    self.SetStatus(**filtered_dict)
+                    apply_uppercase_attrs(self, skill)
                     self.oathSkillInfo.append(skill)
                     self.oathSuitInfo.append(oathSuit)
                     if oathSuit.suitId == max_point_oath_suit:
@@ -235,8 +234,7 @@ class CalcEquipMixin(CharacterBase):
             fun = effects.execture(f'equ_{equ.id}')
             if fun is None:
                 continue
-            filtered_dict = {k: v for k, v in equ.__dict__.items() if k[0].isupper()}
-            self.SetStatus(**filtered_dict)
+            apply_uppercase_attrs(self, equ)
             fun(self)
             fun = effects.execture(f'enchant_{enchat}')
             if fun is not None:
@@ -286,8 +284,7 @@ class CalcEquipMixin(CharacterBase):
             fun = effects.execture(f'oath_{oath.id}')
             if fun is None:
                 continue
-            filtered_dict = {k: v for k, v in oath.__dict__.items() if k[0].isupper()}
-            self.SetStatus(**filtered_dict)
+            apply_uppercase_attrs(self, oath)
             fun(self)
         pass
 
@@ -403,12 +400,13 @@ class CalcEquipMixin(CharacterBase):
     # region 主计算入口
 
     def calc(self, setInfo: dict[str, dict]):
-        self.calc_init(setInfo)
+        config = CalcConfigView(setInfo).as_legacy_dict()
+        self.calc_init(config)
         self.SetBaseStatus()
-        self.calc_jade(setInfo.get('jades', []))
-        self.calc_avatar(setInfo.get('avatar', {}))
+        self.calc_jade(config.get('jades', []))
+        self.calc_avatar(config.get('avatar', {}))
         self.calc_basic()
-        self.calc_sundry(setInfo.get('sundry', {}))
+        self.calc_sundry(config.get('sundry', {}))
         self.calc_emblems()
         suit = self.calc_suits()
         self.calc_equs()
@@ -430,7 +428,7 @@ class CalcEquipMixin(CharacterBase):
                         self.输出类型 = '魔法百分比'
                     else:
                         self.输出类型 = '物理百分比'
-            skillInfos = self.calc_carry_skills(setInfo.get('DSB', False), setInfo.get('BUFF', False))
+            skillInfos = self.calc_carry_skills(config.get('DSB', False), config.get('BUFF', False))
             info = self.get_carry_info()
         return {'uuid': uuid1().hex, 'skills': skillInfos, 'info': info, 'suits': suit, 'buffer': self.buffer}
 
diff --git a/backend/core/basic/character/config_view.py b/backend/core/basic/character/config_view.py
new file mode 100644
index 00000000..91aa3a7c
--- /dev/null
+++ b/backend/core/basic/character/config_view.py
@@ -0,0 +1,61 @@
+from collections.abc import Mapping
+from typing import Any
+
+
+class CalcConfigView:
+    def __init__(self, raw: Mapping[str, Any] | None):
+        self.raw = dict(raw or {})
+
+    @property
+    def equips(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('equips') or {})
+
+    @property
+    def oaths(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('oaths') or {})
+
+    @property
+    def emblems(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('emblems') or {})
+
+    @property
+    def skills(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('skills') or {})
+
+    @property
+    def avatar(self) -> dict[str, Any]:
+        return dict(self.raw.get('avatar') or {})
+
+    @property
+    def sundry(self) -> dict[str, Any]:
+        return dict(self.raw.get('sundry') or {})
+
+    @property
+    def jades(self) -> dict[str, Any]:
+        return dict(self.raw.get('jades') or {})
+
+    @property
+    def options(self) -> dict[str, Any]:
+        return dict(self.raw.get('options') or {})
+
+    @property
+    def dsb(self) -> bool:
+        return bool(self.raw.get('DSB', False))
+
+    @property
+    def buff(self) -> bool:
+        return bool(self.raw.get('BUFF', False))
+
+    def as_legacy_dict(self) -> dict[str, Any]:
+        data = dict(self.raw)
+        data.setdefault('equips', {})
+        data.setdefault('oaths', {})
+        data.setdefault('emblems', {})
+        data.setdefault('skills', {})
+        data.setdefault('avatar', {})
+        data.setdefault('sundry', {})
+        data.setdefault('jades', {})
+        data.setdefault('options', {})
+        data.setdefault('DSB', False)
+        data.setdefault('BUFF', False)
+        return data
diff --git a/backend/core/basic/character/effect_apply.py b/backend/core/basic/character/effect_apply.py
new file mode 100644
index 00000000..5eabdbbd
--- /dev/null
+++ b/backend/core/basic/character/effect_apply.py
@@ -0,0 +1,17 @@
+from typing import Any
+
+
+def uppercase_attrs(source: Any) -> dict[str, Any]:
+    return {key: value for key, value in source.__dict__.items() if key and key[0].isupper()}
+
+
+def apply_uppercase_attrs(character: Any, source: Any) -> None:
+    character.SetStatus(**uppercase_attrs(source))
+
+
+def execute_effect(effects: Any, key: str, *args: Any) -> bool:
+    fun = effects.execture(key)
+    if fun is None:
+        return False
+    fun(*args)
+    return True
diff --git a/backend/core/basic/equipment.py b/backend/core/basic/equipment.py
index 4143b3e5..8549fb2f 100644
--- a/backend/core/basic/equipment.py
+++ b/backend/core/basic/equipment.py
@@ -4,6 +4,7 @@ from functools import cache
 from sqlalchemy.orm import Session
 from database.models import EmblemData, OathData, OathSuitData, OathSuitSkillData, PrimerData, EquData, SuitData, EnchantData, JadeData
 from database.connect import get_db_engine as get_engine
+from core.basic.equipment_registry import EquipmentRegistry
 
 
 def parse_to_number_list(info: str, default: Sequence[float] = (0,)) -> list[float]:
@@ -422,14 +423,8 @@ class OathSuit:
         self.__dict__.update(kwargs)
 
 
-global equ0
-equ0 = Equipments('0')
+_equipment_registry = EquipmentRegistry(Equipments)
 
 
 def get_equipment(version: str = '0') -> Equipments:
-    # print('加载装备信息')
-    try:
-        temp = eval(f'equ{version}'.format(version))
-    except Exception:
-        temp = equ0
-    return temp
+    return _equipment_registry.get(version)
diff --git a/backend/core/basic/equipment_registry.py b/backend/core/basic/equipment_registry.py
new file mode 100644
index 00000000..3ad157ca
--- /dev/null
+++ b/backend/core/basic/equipment_registry.py
@@ -0,0 +1,22 @@
+from functools import cache
+from pathlib import Path
+
+from database.connect import BACKEND_DIR
+
+
+class EquipmentRegistry:
+    def __init__(self, equipment_cls):
+        self.equipment_cls = equipment_cls
+
+    @cache
+    def get(self, version: str = '0'):
+        normalized = version or '0'
+        if not self._version_exists(normalized):
+            if normalized == '0':
+                return self.equipment_cls(normalized)
+            return self.get('0')
+        return self.equipment_cls(normalized)
+
+    def _version_exists(self, version: str) -> bool:
+        db_path = Path(BACKEND_DIR) / 'dataFiles' / f'dcalc_{version}.db'
+        return db_path.exists()
diff --git a/backend/core/character/GF/imperialknight/infighter.py b/backend/core/character/GF/imperialknight/breaker.py
similarity index 97%
rename from backend/core/character/GF/imperialknight/infighter.py
rename to backend/core/character/GF/imperialknight/breaker.py
index 5916b7da..44d8f367 100644
--- a/backend/core/character/GF/imperialknight/infighter.py
+++ b/backend/core/character/GF/imperialknight/breaker.py
@@ -1,10 +1,10 @@
 #8d4d2001cdb357e41633c234eb7501b5
 from core.basic.skill import PassiveSkill, ActiveSkill, get_data
 from core.basic.character import Character
-prefix = "imperialknight/infighter/cn/skillDetail"
+prefix = "imperialknight/breaker/cn/skillDetail"
 
 # 레이즈 어퍼컷
-# imperialknight/infighter/3c5604bdbb0240b8f130f59ab40509c3
+# imperialknight/breaker/3c5604bdbb0240b8f130f59ab40509c3
 # 8d4d2001cdb357e41633c234eb7501b5/3c5604bdbb0240b8f130f59ab40509c3
 class Skill0(ActiveSkill):
     """
@@ -29,7 +29,7 @@ class Skill0(ActiveSkill):
     data0 = get_data(f'{prefix}/{uuid}', 0)
 
 # 덱 브레이커
-# imperialknight/infighter/717f1e2104fe4b796f800352fa143ecc
+# imperialknight/breaker/717f1e2104fe4b796f800352fa143ecc
 # 8d4d2001cdb357e41633c234eb7501b5/717f1e2104fe4b796f800352fa143ecc
 class Skill1(PassiveSkill):
     """
@@ -56,7 +56,7 @@ class Skill1(PassiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 聚焦射击
-# imperialknight/infighter/eb71e1d82d92c7e1d40500a0dcd77aa6
+# imperialknight/breaker/eb71e1d82d92c7e1d40500a0dcd77aa6
 # 8d4d2001cdb357e41633c234eb7501b5/eb71e1d82d92c7e1d40500a0dcd77aa6
 class Skill2(ActiveSkill):
     """
@@ -80,7 +80,7 @@ class Skill2(ActiveSkill):
     data0 = get_data(f'{prefix}/{uuid}', 0)
 
 # 后跳
-# imperialknight/infighter/7822d6d52e10964a6755f142c666b494
+# imperialknight/breaker/7822d6d52e10964a6755f142c666b494
 # 8d4d2001cdb357e41633c234eb7501b5/7822d6d52e10964a6755f142c666b494
 class Skill3(ActiveSkill):
     """
@@ -101,7 +101,7 @@ class Skill3(ActiveSkill):
 
 
 # 基础精通
-# imperialknight/infighter/5a56514f35cf0270ae8d6c65f8fefd78
+# imperialknight/breaker/5a56514f35cf0270ae8d6c65f8fefd78
 # 8d4d2001cdb357e41633c234eb7501b5/5a56514f35cf0270ae8d6c65f8fefd78
 class Skill4(PassiveSkill):
     """
@@ -132,7 +132,7 @@ class Skill4(PassiveSkill):
     data2 = get_data(f'{prefix}/{uuid}', 2)
 
 # 受身蹲伏
-# imperialknight/infighter/ce26c6b69d02a440a81b552bec94f03b
+# imperialknight/breaker/ce26c6b69d02a440a81b552bec94f03b
 # 8d4d2001cdb357e41633c234eb7501b5/ce26c6b69d02a440a81b552bec94f03b
 class Skill5(ActiveSkill):
     """
@@ -163,7 +163,7 @@ class Skill5(ActiveSkill):
     data2 = get_data(f'{prefix}/{uuid}', 2)
 
 # 技能连招
-# imperialknight/infighter/10b31c7e8cd2d60b9bcf3b1d3ada4b0a
+# imperialknight/breaker/10b31c7e8cd2d60b9bcf3b1d3ada4b0a
 # 8d4d2001cdb357e41633c234eb7501b5/10b31c7e8cd2d60b9bcf3b1d3ada4b0a
 class Skill6(ActiveSkill):
     """
@@ -206,7 +206,7 @@ class Skill6(ActiveSkill):
 
 
 # 防具精通
-# imperialknight/infighter/892ef624d8bf3d7fc045f84825fd6104
+# imperialknight/breaker/892ef624d8bf3d7fc045f84825fd6104
 # 8d4d2001cdb357e41633c234eb7501b5/892ef624d8bf3d7fc045f84825fd6104
 class Skill7(PassiveSkill):
     """
@@ -228,7 +228,7 @@ class Skill7(PassiveSkill):
 
 
 # 近敌灭杀
-# imperialknight/infighter/9dda3f4a849dba1a288dd65e116860f2
+# imperialknight/breaker/9dda3f4a849dba1a288dd65e116860f2
 # 8d4d2001cdb357e41633c234eb7501b5/9dda3f4a849dba1a288dd65e116860f2
 class Skill8(ActiveSkill):
     """
@@ -257,7 +257,7 @@ class Skill8(ActiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 加农炮
-# imperialknight/infighter/4655101518604f874721b3cc249aae10
+# imperialknight/breaker/4655101518604f874721b3cc249aae10
 # 8d4d2001cdb357e41633c234eb7501b5/4655101518604f874721b3cc249aae10
 class Skill9(ActiveSkill):
     """
@@ -286,7 +286,7 @@ class Skill9(ActiveSkill):
     # 施放技能过程中所受伤害 -90%
 
 # 퀵 바이섹션
-# imperialknight/infighter/0969cd4054d93da07708108c0cc1c4b5
+# imperialknight/breaker/0969cd4054d93da07708108c0cc1c4b5
 # 8d4d2001cdb357e41633c234eb7501b5/0969cd4054d93da07708108c0cc1c4b5
 class Skill10(ActiveSkill):
     """
@@ -310,7 +310,7 @@ class Skill10(ActiveSkill):
     data0 = get_data(f'{prefix}/{uuid}', 0)
 
 # 러프 보딩
-# imperialknight/infighter/c9664191611af31142e052dfaef84530
+# imperialknight/breaker/c9664191611af31142e052dfaef84530
 # 8d4d2001cdb357e41633c234eb7501b5/c9664191611af31142e052dfaef84530
 class Skill11(ActiveSkill):
     """
@@ -346,7 +346,7 @@ class Skill11(ActiveSkill):
     data2 = get_data(f'{prefix}/{uuid}', 2)
 
 # 强化 - 后跳
-# imperialknight/infighter/2b340542e776818b78f3212af184bd6b
+# imperialknight/breaker/2b340542e776818b78f3212af184bd6b
 # 8d4d2001cdb357e41633c234eb7501b5/2b340542e776818b78f3212af184bd6b
 class Skill12(PassiveSkill):
     """
@@ -379,7 +379,7 @@ class Skill12(PassiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 跃翔
-# imperialknight/infighter/1fea5a626f15230237946a11a9d11582
+# imperialknight/breaker/1fea5a626f15230237946a11a9d11582
 # 8d4d2001cdb357e41633c234eb7501b5/1fea5a626f15230237946a11a9d11582
 class Skill13(ActiveSkill):
     """
@@ -406,7 +406,7 @@ class Skill13(ActiveSkill):
     data0 = get_data(f'{prefix}/{uuid}', 0)
 
 # 노 쿼터
-# imperialknight/infighter/f2fb27162beb0b87a7cb9af7900e95f2
+# imperialknight/breaker/f2fb27162beb0b87a7cb9af7900e95f2
 # 8d4d2001cdb357e41633c234eb7501b5/f2fb27162beb0b87a7cb9af7900e95f2
 class Skill14(PassiveSkill):
     """
@@ -431,7 +431,7 @@ class Skill14(PassiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 #     将飞锚附加到震动箭上， 驱动迷雾能量发射。
-# imperialknight/infighter/cfacda0647b9a0f595df2c2aad30c18d
+# imperialknight/breaker/cfacda0647b9a0f595df2c2aad30c18d
 # 8d4d2001cdb357e41633c234eb7501b5/cfacda0647b9a0f595df2c2aad30c18d
 class Skill15(ActiveSkill):
     """
@@ -460,7 +460,7 @@ class Skill15(ActiveSkill):
     # 施放技能过程中所受伤害 -90%
 
 # 훅 샷
-# imperialknight/infighter/2f5d03c7848effbc0a23f4df45d9ca46
+# imperialknight/breaker/2f5d03c7848effbc0a23f4df45d9ca46
 # 8d4d2001cdb357e41633c234eb7501b5/2f5d03c7848effbc0a23f4df45d9ca46
 class Skill16(ActiveSkill):
     """
@@ -497,7 +497,7 @@ class Skill16(ActiveSkill):
     data2 = get_data(f'{prefix}/{uuid}', 2)
 
 # 어베스트
-# imperialknight/infighter/45442bbbe33540b4deeec29437dae70c
+# imperialknight/breaker/45442bbbe33540b4deeec29437dae70c
 # 8d4d2001cdb357e41633c234eb7501b5/45442bbbe33540b4deeec29437dae70c
 class Skill17(ActiveSkill):
     """
@@ -525,7 +525,7 @@ class Skill17(ActiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 선체 파괴
-# imperialknight/infighter/01c3a2fb793d293a25ed8dc7a0d70c1a
+# imperialknight/breaker/01c3a2fb793d293a25ed8dc7a0d70c1a
 # 8d4d2001cdb357e41633c234eb7501b5/01c3a2fb793d293a25ed8dc7a0d70c1a
 class Skill18(ActiveSkill):
     """
@@ -555,7 +555,7 @@ class Skill18(ActiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 暴击
-# imperialknight/infighter/fc1262c19f3d0477ee8eda47b8db8696
+# imperialknight/breaker/fc1262c19f3d0477ee8eda47b8db8696
 # 8d4d2001cdb357e41633c234eb7501b5/fc1262c19f3d0477ee8eda47b8db8696
 class Skill19(PassiveSkill):
     """
@@ -577,7 +577,7 @@ class Skill19(PassiveSkill):
     data0 = get_data(f'{prefix}/{uuid}', 0)
 
 # 스위핑 스트라이크
-# imperialknight/infighter/8f73f243041c2d27739fe7696f02bf9b
+# imperialknight/breaker/8f73f243041c2d27739fe7696f02bf9b
 # 8d4d2001cdb357e41633c234eb7501b5/8f73f243041c2d27739fe7696f02bf9b
 class Skill20(ActiveSkill):
     """
@@ -612,7 +612,7 @@ class Skill20(ActiveSkill):
     data3 = get_data(f'{prefix}/{uuid}', 3)
 
 # 백병전 전문가
-# imperialknight/infighter/8c2379737c5acc935c1731f67f607655
+# imperialknight/breaker/8c2379737c5acc935c1731f67f607655
 # 8d4d2001cdb357e41633c234eb7501b5/8c2379737c5acc935c1731f67f607655
 class Skill21(PassiveSkill):
     """
@@ -639,7 +639,7 @@ class Skill21(PassiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 타이드 피어서
-# imperialknight/infighter/9cb6f9ed646fa87f9b7680a42ce83d1a
+# imperialknight/breaker/9cb6f9ed646fa87f9b7680a42ce83d1a
 # 8d4d2001cdb357e41633c234eb7501b5/9cb6f9ed646fa87f9b7680a42ce83d1a
 class Skill22(ActiveSkill):
     """
@@ -670,7 +670,7 @@ class Skill22(ActiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 딥 워터 콜
-# imperialknight/infighter/3829c15bf5f520c13998a3479ba0ce7b
+# imperialknight/breaker/3829c15bf5f520c13998a3479ba0ce7b
 # 8d4d2001cdb357e41633c234eb7501b5/3829c15bf5f520c13998a3479ba0ce7b
 class Skill23(ActiveSkill):
     """
@@ -717,7 +717,7 @@ class Skill23(ActiveSkill):
     data6 = get_data(f'{prefix}/{uuid}', 6)
 
 #     狂风可以在空中使用机枪和导弹攻击敌人。 持续时间结束、 召唤出新的狂风机器人， 或机械师死亡后， 狂风会爆炸并给予周围敌人一定伤害。
-# imperialknight/infighter/4224f9b0b8c7c903e9a1e0f9d9f6d04d
+# imperialknight/breaker/4224f9b0b8c7c903e9a1e0f9d9f6d04d
 # 8d4d2001cdb357e41633c234eb7501b5/4224f9b0b8c7c903e9a1e0f9d9f6d04d
 class Skill24(ActiveSkill):
     """
@@ -771,7 +771,7 @@ class Skill24(ActiveSkill):
         ...
 
 # 타이드 바운드
-# imperialknight/infighter/78bd107acd474518b606be1e4fd38239
+# imperialknight/breaker/78bd107acd474518b606be1e4fd38239
 # 8d4d2001cdb357e41633c234eb7501b5/78bd107acd474518b606be1e4fd38239
 class Skill25(ActiveSkill):
     """
@@ -850,7 +850,7 @@ class Skill25(ActiveSkill):
         ...
 
 # 역조연격
-# imperialknight/infighter/d085127b0edd719782bd618d5688f4a1
+# imperialknight/breaker/d085127b0edd719782bd618d5688f4a1
 # 8d4d2001cdb357e41633c234eb7501b5/d085127b0edd719782bd618d5688f4a1
 class Skill26(ActiveSkill):
     """
@@ -906,7 +906,7 @@ class Skill26(ActiveSkill):
         ...
 
 # 黑暗明王阵
-# imperialknight/infighter/42c82812f86ff6704ae9952a2e6093a4
+# imperialknight/breaker/42c82812f86ff6704ae9952a2e6093a4
 # 8d4d2001cdb357e41633c234eb7501b5/42c82812f86ff6704ae9952a2e6093a4
 class Skill27(ActiveSkill):
     """
@@ -968,7 +968,7 @@ class Skill27(ActiveSkill):
         ...
 
 # 골칫거리
-# imperialknight/infighter/3d8f3d438405d79f8d3ed68072674d1e
+# imperialknight/breaker/3d8f3d438405d79f8d3ed68072674d1e
 # 8d4d2001cdb357e41633c234eb7501b5/3d8f3d438405d79f8d3ed68072674d1e
 class Skill28(PassiveSkill):
     """
@@ -999,7 +999,7 @@ class Skill28(PassiveSkill):
     data1 = get_data(f'{prefix}/{uuid}', 1)
 
 # 개전의 팡파르
-# imperialknight/infighter/ade01c1d6afc8a05055225045e89fe49
+# imperialknight/breaker/ade01c1d6afc8a05055225045e89fe49
 # 8d4d2001cdb357e41633c234eb7501b5/ade01c1d6afc8a05055225045e89fe49
 class Skill29(ActiveSkill):
     """
@@ -1036,7 +1036,7 @@ class Skill29(ActiveSkill):
     data4 = get_data(f'{prefix}/{uuid}', 4)
 
 # 破冰飞刃
-# imperialknight/infighter/ff171dc487807bb9aa28900ca9a46b41
+# imperialknight/breaker/ff171dc487807bb9aa28900ca9a46b41
 # 8d4d2001cdb357e41633c234eb7501b5/ff171dc487807bb9aa28900ca9a46b41
 class Skill30(ActiveSkill):
     """
@@ -1093,7 +1093,7 @@ class Skill30(ActiveSkill):
         ...
 
 # 마엘스트롬
-# imperialknight/infighter/547ab2b2bd860d3e37355a9cfbc1077c
+# imperialknight/breaker/547ab2b2bd860d3e37355a9cfbc1077c
 # 8d4d2001cdb357e41633c234eb7501b5/547ab2b2bd860d3e37355a9cfbc1077c
 class Skill31(ActiveSkill):
     """
@@ -1156,7 +1156,7 @@ class Skill31(ActiveSkill):
         ...
 
 # 철의 노래
-# imperialknight/infighter/506e7ed77d517419a6e1c437a2cedb17
+# imperialknight/breaker/506e7ed77d517419a6e1c437a2cedb17
 # 8d4d2001cdb357e41633c234eb7501b5/506e7ed77d517419a6e1c437a2cedb17
 class Skill32(PassiveSkill):
     """
@@ -1180,7 +1180,7 @@ class Skill32(PassiveSkill):
     data0 = get_data(f'{prefix}/{uuid}', 0)
 
 # 冷血突刺
-# imperialknight/infighter/a5fa08f5d509e6ff2ebc68856a470b5a
+# imperialknight/breaker/a5fa08f5d509e6ff2ebc68856a470b5a
 # 8d4d2001cdb357e41633c234eb7501b5/a5fa08f5d509e6ff2ebc68856a470b5a
 class Skill33(ActiveSkill):
     """
@@ -1246,7 +1246,7 @@ class Skill33(ActiveSkill):
         ...
 
 # 교룡아
-# imperialknight/infighter/5dc7008b12a459325b548b0715c6b73c
+# imperialknight/breaker/5dc7008b12a459325b548b0715c6b73c
 # 8d4d2001cdb357e41633c234eb7501b5/5dc7008b12a459325b548b0715c6b73c
 class Skill34(ActiveSkill):
     """
@@ -1315,7 +1315,7 @@ class Skill34(ActiveSkill):
         ...
 
 # 씨 베인
-# imperialknight/infighter/8ee0099656df08a0b39225f8a21d514b
+# imperialknight/breaker/8ee0099656df08a0b39225f8a21d514b
 # 8d4d2001cdb357e41633c234eb7501b5/8ee0099656df08a0b39225f8a21d514b
 class Skill35(ActiveSkill):
     """
@@ -1356,7 +1356,7 @@ class Skill35(ActiveSkill):
     data4 = get_data(f'{prefix}/{uuid}', 4)
 
 # 역조
-# imperialknight/infighter/9bff7f2559e003766fee2853dca00631
+# imperialknight/breaker/9bff7f2559e003766fee2853dca00631
 # 8d4d2001cdb357e41633c234eb7501b5/9bff7f2559e003766fee2853dca00631
 class Skill36(PassiveSkill):
     """
@@ -1389,7 +1389,7 @@ class Skill36(PassiveSkill):
     # 타이드 피어서 받는 데미지 감소율 : 30%
 
 # 언바운드 템페스트
-# imperialknight/infighter/da6e37c1e3f0e8867f70007d89c239ff
+# imperialknight/breaker/da6e37c1e3f0e8867f70007d89c239ff
 # 8d4d2001cdb357e41633c234eb7501b5/da6e37c1e3f0e8867f70007d89c239ff
 class Skill37(ActiveSkill):
     """
@@ -1427,7 +1427,7 @@ class Skill37(ActiveSkill):
     data3 = get_data(f'{prefix}/{uuid}', 3)
 
 # 해신낙연
-# imperialknight/infighter/a6c8f69107f8c4f5d1a0c7a57d000290
+# imperialknight/breaker/a6c8f69107f8c4f5d1a0c7a57d000290
 # 8d4d2001cdb357e41633c234eb7501b5/a6c8f69107f8c4f5d1a0c7a57d000290
 class Skill38(ActiveSkill):
     """
@@ -1466,7 +1466,7 @@ class Skill38(ActiveSkill):
 class classChange(Character):
     def __init__(self, equVersion):
 
-        self.name = 'infighter'
+        self.name = 'breaker'
         self.nameCN = '鸣锋·破浪者'
         self.role = 'imperialknight'
         self.角色 = '帝国骑士'
diff --git a/backend/openapi b/backend/openapi
index abf3eca4..9d741b23 160000
--- a/backend/openapi
+++ b/backend/openapi
@@ -1 +1 @@
-Subproject commit abf3eca40cc1ec3807c80fef81f889329e16f921
+Subproject commit 9d741b23d2ffedb133a6b3944f7289d0d58f3818
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 5cc61cec..cdc2e615 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -15,5 +15,6 @@ dependencies = [
 
 [dependency-groups]
 dev = [
+    "pytest>=8.4.0",
     "ruff>=0.15.15",
 ]
diff --git a/backend/services/__init__.py b/backend/services/__init__.py
new file mode 100644
index 00000000..d022bef7
--- /dev/null
+++ b/backend/services/__init__.py
@@ -0,0 +1 @@
+"""Application services for backend API orchestration."""
diff --git a/backend/services/calc_service.py b/backend/services/calc_service.py
new file mode 100644
index 00000000..d4c1cb3a
--- /dev/null
+++ b/backend/services/calc_service.py
@@ -0,0 +1,27 @@
+import logging
+import time
+from typing import Any
+
+from api.core.Auth import AlterState
+from core.basic.character import createCharacter
+
+
+logger = logging.getLogger('dcalc.calc')
+
+
+def calculate(state: AlterState, config: dict[str, Any] | None) -> dict[str, Any]:
+    started_at = time.perf_counter()
+    safe_config = config or {}
+    character = createCharacter(state.alter, state.equVersion)
+    created_at = time.perf_counter()
+    result = character.calc(safe_config)
+    finished_at = time.perf_counter()
+    logger.info(
+        'calc completed alter=%s equVersion=%s create_ms=%.2f calc_ms=%.2f total_ms=%.2f',
+        state.alter,
+        state.equVersion,
+        (created_at - started_at) * 1000,
+        (finished_at - created_at) * 1000,
+        (finished_at - started_at) * 1000,
+    )
+    return result
diff --git a/backend/tests/conftest.py b/backend/tests/conftest.py
new file mode 100644
index 00000000..b97dffa9
--- /dev/null
+++ b/backend/tests/conftest.py
@@ -0,0 +1,69 @@
+import base64
+import json
+import sys
+import time
+from pathlib import Path
+
+import pytest
+from fastapi.testclient import TestClient
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+from main import application
+
+
+@pytest.fixture
+def client():
+    return TestClient(application)
+
+
+@pytest.fixture
+def alter_token():
+    payload = {
+        'alter': 'MDAwMDAw',
+        'equVersion': '0',
+        'time': int(time.time() * 1000),
+    }
+    return base64.b64encode(json.dumps(payload).encode('utf-8')).decode('utf-8')
+
+
+@pytest.fixture
+def minimal_calc_config():
+    parts = [
+        '武器',
+        '副武器',
+        '称号',
+        '上衣',
+        '头肩',
+        '下装',
+        '腰带',
+        '鞋',
+        '手镯',
+        '项链',
+        '戒指',
+        '辅助装备',
+        '魔法石',
+        '耳环',
+    ]
+    return {
+        'equips': {
+            part: {
+                'id': '',
+                'reinforce': 0,
+                'reinforceType': 0,
+                'enchant': '0',
+                'refine': 0,
+                'adaptation': 0,
+            }
+            for part in parts
+        },
+        'oaths': {},
+        'emblems': {},
+        'skills': {},
+        'avatar': {},
+        'sundry': {},
+        'jades': {},
+        'options': {},
+        'DSB': False,
+        'BUFF': False,
+    }
diff --git a/backend/tests/contract/test_calc_contract.py b/backend/tests/contract/test_calc_contract.py
new file mode 100644
index 00000000..81cab551
--- /dev/null
+++ b/backend/tests/contract/test_calc_contract.py
@@ -0,0 +1,19 @@
+def test_calc_response_contract(client, alter_token, minimal_calc_config):
+    response = client.post(
+        '/api/calc',
+        headers={'alter-token': alter_token},
+        json=minimal_calc_config,
+    )
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload['code'] == 200
+    assert payload['message'] == 'Success'
+    assert isinstance(payload['data'], dict)
+
+    data = payload['data']
+    assert set(['uuid', 'skills', 'info', 'suits', 'buffer']).issubset(data)
+    assert isinstance(data['uuid'], str)
+    assert isinstance(data['skills'], list)
+    assert isinstance(data['info'], list)
+    assert isinstance(data['buffer'], bool)
diff --git a/backend/tests/golden/test_calc_golden.py b/backend/tests/golden/test_calc_golden.py
new file mode 100644
index 00000000..bf5ca177
--- /dev/null
+++ b/backend/tests/golden/test_calc_golden.py
@@ -0,0 +1,13 @@
+from core.basic.character import createCharacter
+
+
+def test_character_calc_returns_result_shape(minimal_calc_config):
+    character = createCharacter('GF.swordman_male.weapon_master', '0')
+
+    result = character.calc(minimal_calc_config)
+
+    assert isinstance(result, dict)
+    assert set(['uuid', 'skills', 'info', 'suits', 'buffer']).issubset(result)
+    assert isinstance(result['skills'], list)
+    assert isinstance(result['info'], list)
+    assert result['buffer'] is False
diff --git a/backend/tests/unit/test_calc_config_view.py b/backend/tests/unit/test_calc_config_view.py
new file mode 100644
index 00000000..200ee1ed
--- /dev/null
+++ b/backend/tests/unit/test_calc_config_view.py
@@ -0,0 +1,27 @@
+from core.basic.character.config_view import CalcConfigView
+
+
+def test_config_view_provides_defaults():
+    view = CalcConfigView(None)
+
+    assert view.equips == {}
+    assert view.oaths == {}
+    assert view.emblems == {}
+    assert view.skills == {}
+    assert view.avatar == {}
+    assert view.sundry == {}
+    assert view.jades == {}
+    assert view.options == {}
+    assert view.dsb is False
+    assert view.buff is False
+
+
+def test_config_view_preserves_legacy_keys():
+    view = CalcConfigView({'skills': {'100': {'lv': 1}}, 'BUFF': True})
+
+    data = view.as_legacy_dict()
+
+    assert data['skills'] == {'100': {'lv': 1}}
+    assert data['BUFF'] is True
+    assert data['DSB'] is False
+    assert data['equips'] == {}
diff --git a/backend/tests/unit/test_calc_service.py b/backend/tests/unit/test_calc_service.py
new file mode 100644
index 00000000..d96a1430
--- /dev/null
+++ b/backend/tests/unit/test_calc_service.py
@@ -0,0 +1,22 @@
+import logging
+
+from api.core.Auth import AlterState
+from services.calc_service import calculate
+
+
+def test_calculate_returns_character_calc_result(minimal_calc_config):
+    state = AlterState('GF.swordman_male.weapon_master', 'token', {}, '0', 0)
+
+    result = calculate(state, minimal_calc_config)
+
+    assert isinstance(result, dict)
+    assert set(['uuid', 'skills', 'info', 'suits', 'buffer']).issubset(result)
+
+
+def test_calculate_logs_timing(caplog, minimal_calc_config):
+    state = AlterState('GF.swordman_male.weapon_master', 'token', {}, '0', 0)
+
+    with caplog.at_level(logging.INFO, logger='dcalc.calc'):
+        calculate(state, minimal_calc_config)
+
+    assert any('calc completed alter=GF.swordman_male.weapon_master' in record.message for record in caplog.records)
diff --git a/backend/tests/unit/test_config.py b/backend/tests/unit/test_config.py
new file mode 100644
index 00000000..b7a771e3
--- /dev/null
+++ b/backend/tests/unit/test_config.py
@@ -0,0 +1,5 @@
+from config.main import Config
+
+
+def test_config_ignores_extra_environment_fields():
+    assert Config.model_config.get('extra') == 'ignore'
diff --git a/backend/tests/unit/test_effect_apply.py b/backend/tests/unit/test_effect_apply.py
new file mode 100644
index 00000000..bb100113
--- /dev/null
+++ b/backend/tests/unit/test_effect_apply.py
@@ -0,0 +1,35 @@
+from core.basic.character.effect_apply import execute_effect, uppercase_attrs
+
+
+class Source:
+    STR = 10
+
+    def __init__(self):
+        self.INT = 20
+        self.name = 'ignored'
+
+
+class Effects:
+    def execture(self, key):
+        if key != 'known':
+            return None
+
+        def effect(target):
+            target.append(key)
+
+        return effect
+
+
+def test_uppercase_attrs_returns_only_uppercase_instance_keys():
+    assert uppercase_attrs(Source()) == {'INT': 20}
+
+
+def test_execute_effect_returns_false_for_missing_effect():
+    assert execute_effect(Effects(), 'missing', []) is False
+
+
+def test_execute_effect_calls_existing_effect():
+    target = []
+
+    assert execute_effect(Effects(), 'known', target) is True
+    assert target == ['known']
diff --git a/backend/tests/unit/test_equipment_registry.py b/backend/tests/unit/test_equipment_registry.py
new file mode 100644
index 00000000..d91473ca
--- /dev/null
+++ b/backend/tests/unit/test_equipment_registry.py
@@ -0,0 +1,30 @@
+from core.basic.equipment import get_equipment
+from core.basic.equipment_registry import EquipmentRegistry
+
+
+def test_get_equipment_returns_cached_default_version():
+    first = get_equipment('0')
+    second = get_equipment('0')
+
+    assert first is second
+    assert first.version == '0'
+
+
+def test_get_equipment_falls_back_to_default_version():
+    equipment = get_equipment('missing-version')
+
+    assert equipment.version == '0'
+
+
+def test_equipment_registry_caches_by_version():
+    calls = []
+
+    class Equipment:
+        def __init__(self, version):
+            calls.append(version)
+            self.version = version
+
+    registry = EquipmentRegistry(Equipment)
+
+    assert registry.get('0') is registry.get('0')
+    assert calls == ['0']
diff --git a/backend/uv.lock b/backend/uv.lock
index 16b48ad8..3dbdc9bb 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -546,6 +546,7 @@ dependencies = [
 
 [package.dev-dependencies]
 dev = [
+    { name = "pytest" },
     { name = "ruff" },
 ]
 
@@ -560,7 +561,10 @@ requires-dist = [
 ]
 
 [package.metadata.requires-dev]
-dev = [{ name = "ruff", specifier = ">=0.15.15" }]
+dev = [
+    { name = "pytest", specifier = ">=8.4.0" },
+    { name = "ruff", specifier = ">=0.15.15" },
+]
 
 [[package]]
 name = "detect-installer"
@@ -1151,6 +1155,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/fa/5e/f8e9a1d23b9c20a551a8a02ea3637b4642e22c2626e3a13a9a29cdea99eb/importlib_metadata-8.7.1-py3-none-any.whl", hash = "sha256:5a1f80bf1daa489495071efbb095d75a634cf28a8bc299581244063b53176151", size = 27865, upload-time = "2025-12-21T10:00:18.329Z" },
 ]
 
+[[package]]
+name = "iniconfig"
+version = "2.3.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/72/34/14ca021ce8e5dfedc35312d08ba8bf51fdd999c576889fc2c24cb97f4f10/iniconfig-2.3.0.tar.gz", hash = "sha256:c76315c77db068650d49c5b56314774a7804df16fee4402c1f19d6d15d8c4730", size = 20503, upload-time = "2025-10-18T21:55:43.219Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/cb/b1/3846dd7f199d53cb17f49cba7e651e9ce294d8497c8c150530ed11865bb8/iniconfig-2.3.0-py3-none-any.whl", hash = "sha256:f631c04d2c48c52b84d0d0549c99ff3859c98df65b3101406327ecc7d53fbf12", size = 7484, upload-time = "2025-10-18T21:55:41.639Z" },
+]
+
 [[package]]
 name = "itsdangerous"
 version = "2.2.0"
@@ -1600,6 +1613,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/63/d7/97f7e3a6abb67d8080dd406fd4df842c2be0efaf712d1c899c32a075027c/platformdirs-4.9.4-py3-none-any.whl", hash = "sha256:68a9a4619a666ea6439f2ff250c12a853cd1cbd5158d258bd824a7df6be2f868", size = 21216, upload-time = "2026-03-05T18:34:12.172Z" },
 ]
 
+[[package]]
+name = "pluggy"
+version = "1.6.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f9/e2/3e91f31a7d2b083fe6ef3fa267035b518369d9511ffab804f839851d2779/pluggy-1.6.0.tar.gz", hash = "sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3", size = 69412, upload-time = "2025-05-15T12:30:07.975Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
+]
+
 [[package]]
 name = "propcache"
 version = "0.4.1"
@@ -1944,6 +1966,24 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/df/80/fc9d01d5ed37ba4c42ca2b55b4339ae6e200b456be3a1aaddf4a9fa99b8c/pyperclip-1.11.0-py3-none-any.whl", hash = "sha256:299403e9ff44581cb9ba2ffeed69c7aa96a008622ad0c46cb575ca75b5b84273", size = 11063, upload-time = "2025-09-26T14:40:36.069Z" },
 ]
 
+[[package]]
+name = "pytest"
+version = "9.0.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "exceptiongroup", marker = "python_full_version < '3.11'" },
+    { name = "iniconfig" },
+    { name = "packaging" },
+    { name = "pluggy" },
+    { name = "pygments" },
+    { name = "tomli", marker = "python_full_version < '3.11'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
+]
+
 [[package]]
 name = "python-dotenv"
 version = "1.1.0"
diff --git a/docs/backend/2026-06-04-backend-optimization-design.md b/docs/backend/2026-06-04-backend-optimization-design.md
new file mode 100644
index 00000000..486d5478
--- /dev/null
+++ b/docs/backend/2026-06-04-backend-optimization-design.md
@@ -0,0 +1,237 @@
+# Backend 渐进式优化设计
+
+> 本文面向 dcalc backend 的渐进式架构优化。目标是在不改变 `/calc` API 契约、不破坏 frontendNew 计算链路的前提下，逐步提升后端可维护性、扩展性、计算效率与开发规范。
+
+## 背景
+
+当前仓库前端迁移主线是 `frontend -> frontendNew`，backend 必须优先服务 Dcalc Character 模块的稳定计算链路：equipment、skill、forge、result。backend 现有结构已经完成过一次 `core/basic/character_old.py` 到 `core/basic/character/` 多文件 mixin 的拆分，说明当前更适合继续做小步收口，而不是推倒重写。
+
+关键入口：
+
+- `/calc` 路由：`backend/api/routes/calc.py`
+- 应用入口：`backend/main.py`
+- 角色计算核心：`backend/core/basic/character/`
+- 装备数据装载：`backend/core/basic/equipment.py`
+- 数据库连接：`backend/database/connect.py`
+- Redis 预热：`backend/api/core/RedisPreheat.py`
+
+## 非目标
+
+- 不改 `/calc` 的请求语义、响应包装、`data` 主体字段结构。
+- 不改 frontendNew 依赖的 IResult 数据消费方式。
+- 不重写 Skill、Forge、装备效果、职业技能的核心业务逻辑。
+- 不在 backend 优化中引入新的 UI、前端状态管理或前端接口契约调整。
+- 不一次性格式化全仓 Python 文件，避免制造大规模无关 diff。
+
+## 现状问题
+
+### API 与计算耦合
+
+`backend/api/routes/calc.py` 直接 `createCharacter(...).calc(config)`。这让鉴权、请求适配、计算编排、错误处理和未来耗时统计都挤在 API 调用路径上，不利于扩展。
+
+### config 读取分散
+
+计算过程中大量直接访问 `setInfo.get(...)`、`info['equips']`、`info['oaths']`。默认值、兼容逻辑和输入容错散落在 mixin 中，后续 Skill/Forge 配置演进时容易漏字段。
+
+### 装备数据全局缓存边界不清
+
+`backend/core/basic/equipment.py` 启动时构造 `equ0 = Equipments('0')`，`get_equipment()` 通过动态变量和 `eval` 获取版本。该方式对当前性能有帮助，但多版本扩展、测试隔离、热更新和错误定位较弱。
+
+### 计算对象状态可变
+
+`Character` 实例在 `calc_init -> calc_* -> calc_*_skills` 过程中持续变异属性、技能等级、装备效果和输出类型。该模式符合当前业务写法，但缺少明确的一次性计算上下文，测试和复用成本偏高。
+
+### 性能缺少量化
+
+已有内存化装备数据、技能类缓存、Redis 预热等优化点，但 `/calc` 的耗时瓶颈没有分段统计。后续不应凭感觉优化。
+
+### 测试安全网不足
+
+当前仅看到 `backend/test.py`，没有正式 `tests/` 体系。后续重构计算链路时，缺少 golden case 来确认字段与数值没有回退。
+
+## 优化原则
+
+1. 接口冻结：先用测试固定 `/calc` 外部行为，再改内部结构。
+2. 小步可回滚：每个阶段能单独合并、单独验证。
+3. 先边界后算法：优先整理 service、config view、repository/registry，再考虑公式与缓存。
+4. 只搬运不改义：拆文件、封 helper 时不改变公式含义。
+5. 先量化后性能：先加耗时指标，再按热点优化。
+
+## 目标架构
+
+```text
+backend/
+  api/
+    routes/
+      calc.py              # 只负责 HTTP 层：依赖注入、Body、response
+  services/
+    calc_service.py        # /calc 应用服务：创建角色、执行计算、计时、错误上下文
+  schemas/
+    calc.py                # 宽松 config schema 与响应类型别名
+    response.py            # 通用响应类型，保持旧格式兼容
+  core/
+    basic/
+      character/
+        config_view.py     # CalcConfigView：统一默认值、兼容旧 config
+        effect_apply.py    # 统一属性提取与 effect 执行 helper
+      equipment.py         # 保留现有模型，逐步委托给 registry
+      equipment_registry.py # EquipmentRegistry：装备版本懒加载与缓存
+  tests/
+    contract/
+      test_calc_contract.py
+    golden/
+      test_calc_golden.py
+    unit/
+      test_equipment_registry.py
+      test_calc_config_view.py
+```
+
+## 数据流
+
+```text
+HTTP POST /api/calc
+  -> AltersDep 解析 alter/equVersion
+  -> calc_service.calculate(state, raw_config)
+  -> CalcConfigView.from_raw(raw_config)
+  -> createCharacter(state.alter, state.equVersion)
+  -> character.calc(config_view 或兼容 dict)
+  -> calc_service 返回原始计算 data
+  -> response(data=data)
+```
+
+短期内 `Character.calc()` 仍接收原 `dict`，`CalcConfigView` 先作为内部读取辅助逐步接入。等测试稳定后，再考虑让 `Character.calc()` 接收 `CalcConfigView`。
+
+## 分阶段设计
+
+### Phase 0：测试安全网
+
+建立 pytest 测试结构，固定 `/calc` 契约和典型职业结果结构。
+
+重点：
+
+- 增加 `pytest` 开发依赖。
+- 增加可复用的最小 config fixture。
+- 增加 `/api/calc` HTTP contract 测试。
+- 增加 `createCharacter(...).calc(...)` golden smoke 测试。
+
+成功标准：
+
+- `uv run pytest` 可执行。
+- `/calc` 响应仍包含 `code/message/data`。
+- `data` 至少包含 `uuid/skills/info/suits/buffer`。
+
+### Phase 1：API service 边界
+
+新增 `backend/services/calc_service.py`，API route 不再直接编排计算。
+
+重点：
+
+- route 保持原路径、请求体和响应格式。
+- service 负责 `createCharacter`、空 config 兜底、计算执行。
+- 为后续日志、耗时、缓存预留 service 层。
+
+成功标准：
+
+- `/api/calc` 行为不变。
+- route 文件只保留 HTTP 层职责。
+- Phase 0 测试全部通过。
+
+### Phase 2：config view 与计算输入收口
+
+新增 `CalcConfigView`，集中处理 config 的默认值与字段读取。
+
+重点：
+
+- `equips/oaths/emblems/skills/avatar/sundry/jades/options` 都有稳定默认值。
+- 先在 `calc_init()`、`SetDetail()`、`SetSkills()` 等入口使用，不一次性替换所有 mixin。
+- 保留向后兼容，仍支持原始 dict。
+
+成功标准：
+
+- 缺少可选字段时不抛出 KeyError。
+- Skill/Forge 配置链路不变：config 变化 -> result.execute -> saveConfig。
+- golden case 结果字段不变。
+
+### Phase 3：装备数据 registry
+
+新增 `EquipmentRegistry`，替换 `get_equipment()` 内部的 `eval` 与模块全局变量访问。
+
+重点：
+
+- `get_equipment(version)` 作为兼容门面继续存在。
+- registry 内部使用 `functools.cache` 或显式 dict 缓存。
+- 版本不存在时保持回退 `0` 的现有行为，但记录原因。
+
+成功标准：
+
+- 现有调用方无需一次性改动。
+- 多版本装备数据加载路径清晰。
+- 单元测试覆盖缓存、回退和不存在版本。
+
+### Phase 4：计算核心 helper 化
+
+抽取重复且无业务争议的 helper，降低 mixin 复杂度。
+
+重点：
+
+- `apply_uppercase_attrs(character, source)` 统一处理首字母大写属性应用。
+- `execute_effect(effects, key, *args)` 统一处理效果函数不存在时的行为。
+- 优先处理 `calc_suits/calc_equs/calc_oaths/calc_emblems` 中重复逻辑。
+
+成功标准：
+
+- helper 有单元测试。
+- 业务公式位置不变或仅做等价搬迁。
+- `calc_equip.py` 可读性提升，结果不变。
+
+### Phase 5：性能观测与热点优化
+
+在 service 层引入轻量计时，再针对热点做优化。
+
+重点：
+
+- 记录 `createCharacter`、`calc` 总耗时。
+- 可选记录 `calc_*` 分段耗时，默认不影响响应结构。
+- 优化重复 `获取基础属性()` 调用。
+- 评估技能实例模板缓存，但必须避免可变技能状态污染请求。
+
+成功标准：
+
+- 能拿到典型配置的平均耗时和 p95。
+- 优化前后 golden case 一致。
+- 性能优化有数据支撑。
+
+### Phase 6：规范与文档
+
+清理运行缓存、废弃文件和文档入口。
+
+重点：
+
+- 确认 `.venv/.ruff_cache/__pycache__/.DS_Store` 不进入 git。
+- 评估 `character_old.py` 移到归档或删除。
+- 补充 backend README：运行、测试、质量检查、目录职责。
+- 不在本阶段大规模格式化老文件。
+
+成功标准：
+
+- 新人可通过文档理解 backend 入口和测试方式。
+- 废弃代码不会继续误导维护。
+- 规范变更不产生大规模业务 diff。
+
+## 风险与缓解
+
+| 风险 | 缓解 |
+| --- | --- |
+| 重构导致 `/calc` 字段变化 | Phase 0 先做 contract/golden 测试 |
+| 技能对象可变状态污染缓存 | 技能模板缓存必须后置，且只缓存类或不可变模板 |
+| 装备版本回退行为改变 | `get_equipment()` 保留兼容门面，并测试回退 |
+| config 字段默认值与前端不一致 | `CalcConfigView` 先只集中现有默认值，不新增语义 |
+| 性能统计污染响应 | 默认只写日志，不改变 API data |
+
+## 验收总标准
+
+- `uv run pytest` 通过。
+- `/api/calc` 响应契约不变。
+- frontendNew 的 result.execute 与 saveConfig 链路无需调整。
+- 典型职业 golden case 在重构前后字段一致，关键数值在允许误差内。
+- backend 文档说明清晰，后续任务可以分阶段执行。
diff --git a/docs/backend/2026-06-04-backend-optimization-tasks.md b/docs/backend/2026-06-04-backend-optimization-tasks.md
new file mode 100644
index 00000000..22182f40
--- /dev/null
+++ b/docs/backend/2026-06-04-backend-optimization-tasks.md
@@ -0,0 +1,908 @@
+# Backend 渐进式优化执行清单
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** 在保持 `/calc` API 契约和 frontendNew 计算链路不变的前提下，逐步提升 backend 的可维护性、扩展性、计算效率与开发规范。
+
+**Architecture:** 先建立测试安全网，再把 HTTP route 与计算编排拆到 service 层，随后用 config view 和 equipment registry 收口隐式边界。最后基于耗时观测做性能优化，并补齐 backend 文档与规范。
+
+**Tech Stack:** Python 3.10+、FastAPI、Pydantic、SQLAlchemy、Redis、SQLite、pytest、ruff、uv。
+
+---
+
+## 文件结构规划
+
+- Create: `backend/tests/conftest.py`  
+  提供测试用 FastAPI client、alter token、最小 calc config fixture。
+
+- Create: `backend/tests/contract/test_calc_contract.py`  
+  固定 `/api/calc` HTTP 响应契约。
+
+- Create: `backend/tests/golden/test_calc_golden.py`  
+  固定典型职业计算结果结构，后续可扩展数值快照。
+
+- Create: `backend/services/__init__.py`  
+  标记 service 包。
+
+- Create: `backend/services/calc_service.py`  
+  承接 `/calc` 应用服务编排。
+
+- Create: `backend/core/basic/character/config_view.py`  
+  集中处理 calc config 默认值与读取。
+
+- Create: `backend/core/basic/equipment_registry.py`  
+  装备版本 registry 与缓存。
+
+- Modify: `backend/api/routes/calc.py`  
+  改为调用 `calc_service.calculate()`，保持 route 契约不变。
+
+- Modify: `backend/core/basic/character/calc_equip.py`  
+  逐步使用 `CalcConfigView` 与 helper，不改计算语义。
+
+- Modify: `backend/core/basic/equipment.py`  
+  `get_equipment()` 委托 `EquipmentRegistry`，保留兼容函数。
+
+- Modify: `backend/pyproject.toml`  
+  增加 `pytest`、必要时增加测试配置。
+
+- Create or Modify: `backend/README.md`  
+  说明运行、测试、质量检查、目录职责。
+
+## Task 1：建立 pytest 基础与最小 contract 测试
+
+**Files:**
+
+- Modify: `backend/pyproject.toml`
+- Create: `backend/tests/conftest.py`
+- Create: `backend/tests/contract/test_calc_contract.py`
+
+- [ ] **Step 1: 添加 pytest 开发依赖**
+
+在 `backend/pyproject.toml` 的 `[dependency-groups].dev` 中加入：
+
+```toml
+[dependency-groups]
+dev = [
+    "pytest>=8.4.0",
+    "ruff>=0.15.15",
+]
+```
+
+- [ ] **Step 2: 同步依赖**
+
+Run:
+
+```bash
+cd backend && uv sync
+```
+
+Expected: `pytest` 安装完成，`uv.lock` 更新。
+
+- [ ] **Step 3: 创建测试 fixture**
+
+Create `backend/tests/conftest.py`:
+
+```python
+import base64
+import json
+import time
+
+import pytest
+from fastapi.testclient import TestClient
+
+from main import application
+
+
+@pytest.fixture
+def client():
+    return TestClient(application)
+
+
+@pytest.fixture
+def alter_token():
+    payload = {
+        'alter': '1.1.1',
+        'equVersion': '0',
+        'time': int(time.time() * 1000),
+    }
+    return base64.b64encode(json.dumps(payload).encode('utf-8')).decode('utf-8')
+
+
+@pytest.fixture
+def minimal_calc_config():
+    parts = [
+        '武器',
+        '副武器',
+        '称号',
+        '上衣',
+        '头肩',
+        '下装',
+        '腰带',
+        '鞋',
+        '手镯',
+        '项链',
+        '戒指',
+        '辅助装备',
+        '魔法石',
+        '耳环',
+    ]
+    return {
+        'equips': {
+            part: {
+                'id': '',
+                'reinforce': 0,
+                'reinforceType': 0,
+                'enchant': '0',
+                'refine': 0,
+                'adaptation': 0,
+            }
+            for part in parts
+        },
+        'oaths': {},
+        'emblems': {},
+        'skills': {},
+        'avatar': {},
+        'sundry': {},
+        'jades': {},
+        'options': {},
+        'DSB': False,
+        'BUFF': False,
+    }
+```
+
+- [ ] **Step 4: 创建 contract 测试**
+
+Create `backend/tests/contract/test_calc_contract.py`:
+
+```python
+def test_calc_response_contract(client, alter_token, minimal_calc_config):
+    response = client.post(
+        '/api/calc',
+        headers={'alter-token': alter_token},
+        json=minimal_calc_config,
+    )
+
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload['code'] == 200
+    assert payload['message'] == 'Success'
+    assert isinstance(payload['data'], dict)
+
+    data = payload['data']
+    assert set(['uuid', 'skills', 'info', 'suits', 'buffer']).issubset(data)
+    assert isinstance(data['uuid'], str)
+    assert isinstance(data['skills'], list)
+    assert isinstance(data['info'], list)
+    assert isinstance(data['buffer'], bool)
+```
+
+- [ ] **Step 5: 运行测试，记录真实失败**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/contract/test_calc_contract.py -v
+```
+
+Expected: 如果 Redis 依赖导致失败，记录失败原因；不要绕过 `/calc` 鉴权契约。后续可在 fixture 中 monkeypatch `api.dp.get_redis_info` 或提供本地 Redis。
+
+- [ ] **Step 6: 提交本任务**
+
+Run:
+
+```bash
+git add backend/pyproject.toml backend/uv.lock backend/tests/conftest.py backend/tests/contract/test_calc_contract.py
+git commit -m "test: add backend calc contract coverage"
+```
+
+## Task 2：增加 core golden smoke 测试
+
+**Files:**
+
+- Create: `backend/tests/golden/test_calc_golden.py`
+
+- [ ] **Step 1: 创建核心计算 smoke 测试**
+
+Create `backend/tests/golden/test_calc_golden.py`:
+
+```python
+from core.basic.character import createCharacter
+
+
+def test_character_calc_returns_result_shape(minimal_calc_config):
+    character = createCharacter('1.1.1', '0')
+
+    result = character.calc(minimal_calc_config)
+
+    assert isinstance(result, dict)
+    assert set(['uuid', 'skills', 'info', 'suits', 'buffer']).issubset(result)
+    assert isinstance(result['skills'], list)
+    assert isinstance(result['info'], list)
+    assert result['buffer'] is False
+```
+
+- [ ] **Step 2: 运行 golden smoke**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/golden/test_calc_golden.py -v
+```
+
+Expected: PASS。若职业 `1.1.1` 不存在，改用 `core.character.adventure` 中第一个 `open=True` 的职业，并同步更新 Task 1 fixture。
+
+- [ ] **Step 3: 运行全部测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest -v
+```
+
+Expected: PASS，或仅 contract 测试因外部 Redis 环境失败且原因明确。
+
+- [ ] **Step 4: 提交本任务**
+
+Run:
+
+```bash
+git add backend/tests/golden/test_calc_golden.py
+git commit -m "test: add backend calc golden smoke"
+```
+
+## Task 3：引入 calc service，瘦身 API route
+
+**Files:**
+
+- Create: `backend/services/__init__.py`
+- Create: `backend/services/calc_service.py`
+- Modify: `backend/api/routes/calc.py`
+- Test: `backend/tests/contract/test_calc_contract.py`
+- Test: `backend/tests/golden/test_calc_golden.py`
+
+- [ ] **Step 1: 创建 service 包**
+
+Create `backend/services/__init__.py`:
+
+```python
+"""Application services for backend API orchestration."""
+```
+
+- [ ] **Step 2: 创建 calc service**
+
+Create `backend/services/calc_service.py`:
+
+```python
+from typing import Any
+
+from api.core.Auth import AlterState
+from core.basic.character import createCharacter
+
+
+def calculate(state: AlterState, config: dict[str, Any] | None) -> dict[str, Any]:
+    safe_config = config or {}
+    character = createCharacter(state.alter, state.equVersion)
+    return character.calc(safe_config)
+```
+
+- [ ] **Step 3: 修改 route 调用 service**
+
+Modify `backend/api/routes/calc.py`:
+
+```python
+from api.core.Gzip import register_gzip_request
+from fastapi import APIRouter, Body
+from api.core.Response import response
+from api.dp import AltersDep
+from services.calc_service import calculate
+
+router = APIRouter()
+
+register_gzip_request(router)
+
+
+@router.post('/calc')
+async def calc(state: AltersDep, config=Body(None)):
+    return response(data=calculate(state, config))
+```
+
+- [ ] **Step 4: 运行测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/contract/test_calc_contract.py backend/tests/golden/test_calc_golden.py -v
+```
+
+Expected: PASS。
+
+- [ ] **Step 5: 提交本任务**
+
+Run:
+
+```bash
+git add backend/services/__init__.py backend/services/calc_service.py backend/api/routes/calc.py
+git commit -m "refactor: route calc through service layer"
+```
+
+## Task 4：增加 CalcConfigView，集中 config 默认值
+
+**Files:**
+
+- Create: `backend/core/basic/character/config_view.py`
+- Modify: `backend/core/basic/character/calc_equip.py`
+- Test: `backend/tests/unit/test_calc_config_view.py`
+
+- [ ] **Step 1: 创建 config view**
+
+Create `backend/core/basic/character/config_view.py`:
+
+```python
+from collections.abc import Mapping
+from typing import Any
+
+
+class CalcConfigView:
+    def __init__(self, raw: Mapping[str, Any] | None):
+        self.raw = dict(raw or {})
+
+    @property
+    def equips(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('equips') or {})
+
+    @property
+    def oaths(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('oaths') or {})
+
+    @property
+    def emblems(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('emblems') or {})
+
+    @property
+    def skills(self) -> dict[str, dict[str, Any]]:
+        return dict(self.raw.get('skills') or {})
+
+    @property
+    def avatar(self) -> dict[str, Any]:
+        return dict(self.raw.get('avatar') or {})
+
+    @property
+    def sundry(self) -> dict[str, Any]:
+        return dict(self.raw.get('sundry') or {})
+
+    @property
+    def jades(self) -> dict[str, Any]:
+        return dict(self.raw.get('jades') or {})
+
+    @property
+    def options(self) -> dict[str, Any]:
+        return dict(self.raw.get('options') or {})
+
+    @property
+    def dsb(self) -> bool:
+        return bool(self.raw.get('DSB', False))
+
+    @property
+    def buff(self) -> bool:
+        return bool(self.raw.get('BUFF', False))
+
+    def as_legacy_dict(self) -> dict[str, Any]:
+        data = dict(self.raw)
+        data.setdefault('equips', {})
+        data.setdefault('oaths', {})
+        data.setdefault('emblems', {})
+        data.setdefault('skills', {})
+        data.setdefault('avatar', {})
+        data.setdefault('sundry', {})
+        data.setdefault('jades', {})
+        data.setdefault('options', {})
+        data.setdefault('DSB', False)
+        data.setdefault('BUFF', False)
+        return data
+```
+
+- [ ] **Step 2: 添加单元测试**
+
+Create `backend/tests/unit/test_calc_config_view.py`:
+
+```python
+from core.basic.character.config_view import CalcConfigView
+
+
+def test_config_view_provides_defaults():
+    view = CalcConfigView(None)
+
+    assert view.equips == {}
+    assert view.oaths == {}
+    assert view.emblems == {}
+    assert view.skills == {}
+    assert view.avatar == {}
+    assert view.sundry == {}
+    assert view.jades == {}
+    assert view.options == {}
+    assert view.dsb is False
+    assert view.buff is False
+
+
+def test_config_view_preserves_legacy_keys():
+    view = CalcConfigView({'skills': {'100': {'lv': 1}}, 'BUFF': True})
+
+    data = view.as_legacy_dict()
+
+    assert data['skills'] == {'100': {'lv': 1}}
+    assert data['BUFF'] is True
+    assert data['DSB'] is False
+    assert data['equips'] == {}
+```
+
+- [ ] **Step 3: 在 calc_init 入口使用兼容 dict**
+
+Modify `backend/core/basic/character/calc_equip.py`:
+
+```python
+from .config_view import CalcConfigView
+```
+
+在 `calc()` 起始处改为：
+
+```python
+def calc(self, setInfo: dict[str, dict]):
+    config = CalcConfigView(setInfo).as_legacy_dict()
+    self.calc_init(config)
+    self.SetBaseStatus()
+    self.calc_jade(config.get('jades', []))
+    self.calc_avatar(config.get('avatar', {}))
+    self.calc_basic()
+    self.calc_sundry(config.get('sundry', {}))
+    self.calc_emblems()
+    suit = self.calc_suits()
+    self.calc_equs()
+    self.calc_oaths()
+    skillInfos = []
+    if self.buffer:
+        skillInfos = self.calc_buffer_skills()
+        info = self.get_buffer_info()
+    else:
+        if len(self.输出类型选项) > 1:
+            temp = self.输出类型选项[0]
+            if '固伤' in temp:
+                if self.INT > self.STR:
+                    self.输出类型 = '魔法固伤'
+                else:
+                    self.输出类型 = '物理固伤'
+            else:
+                if self.INT > self.STR and self.AtkM > self.AtkP:
+                    self.输出类型 = '魔法百分比'
+                else:
+                    self.输出类型 = '物理百分比'
+        skillInfos = self.calc_carry_skills(config.get('DSB', False), config.get('BUFF', False))
+        info = self.get_carry_info()
+    return {'uuid': uuid1().hex, 'skills': skillInfos, 'info': info, 'suits': suit, 'buffer': self.buffer}
+```
+
+- [ ] **Step 4: 运行测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/unit/test_calc_config_view.py backend/tests/golden/test_calc_golden.py -v
+```
+
+Expected: PASS。
+
+- [ ] **Step 5: 提交本任务**
+
+Run:
+
+```bash
+git add backend/core/basic/character/config_view.py backend/core/basic/character/calc_equip.py backend/tests/unit/test_calc_config_view.py
+git commit -m "refactor: centralize calc config defaults"
+```
+
+## Task 5：引入 EquipmentRegistry，替换 eval 获取装备数据
+
+**Files:**
+
+- Create: `backend/core/basic/equipment_registry.py`
+- Modify: `backend/core/basic/equipment.py`
+- Test: `backend/tests/unit/test_equipment_registry.py`
+
+- [ ] **Step 1: 创建 registry**
+
+Create `backend/core/basic/equipment_registry.py`:
+
+```python
+from functools import cache
+
+
+class EquipmentRegistry:
+    def __init__(self, equipment_cls):
+        self.equipment_cls = equipment_cls
+
+    @cache
+    def get(self, version: str = '0'):
+        normalized = version or '0'
+        try:
+            return self.equipment_cls(normalized)
+        except Exception:
+            if normalized == '0':
+                raise
+            return self.get('0')
+```
+
+- [ ] **Step 2: 修改 equipment.py 兼容门面**
+
+Modify `backend/core/basic/equipment.py` 底部：
+
+```python
+from core.basic.equipment_registry import EquipmentRegistry
+
+
+_equipment_registry = EquipmentRegistry(Equipments)
+
+
+def get_equipment(version: str = '0') -> Equipments:
+    return _equipment_registry.get(version)
+```
+
+删除或停止使用：
+
+```python
+global equ0
+equ0 = Equipments('0')
+```
+
+以及 `eval(f'equ{version}'.format(version))` 相关逻辑。
+
+- [ ] **Step 3: 添加 registry 测试**
+
+Create `backend/tests/unit/test_equipment_registry.py`:
+
+```python
+from core.basic.equipment import get_equipment
+
+
+def test_get_equipment_returns_cached_default_version():
+    first = get_equipment('0')
+    second = get_equipment('0')
+
+    assert first is second
+    assert first.version == '0'
+
+
+def test_get_equipment_falls_back_to_default_version():
+    equipment = get_equipment('missing-version')
+
+    assert equipment.version == '0'
+```
+
+- [ ] **Step 4: 运行测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/unit/test_equipment_registry.py backend/tests/golden/test_calc_golden.py -v
+```
+
+Expected: PASS。
+
+- [ ] **Step 5: 提交本任务**
+
+Run:
+
+```bash
+git add backend/core/basic/equipment_registry.py backend/core/basic/equipment.py backend/tests/unit/test_equipment_registry.py
+git commit -m "refactor: add equipment registry"
+```
+
+## Task 6：增加 calc service 耗时观测
+
+**Files:**
+
+- Modify: `backend/services/calc_service.py`
+- Test: `backend/tests/contract/test_calc_contract.py`
+
+- [ ] **Step 1: 添加轻量日志计时**
+
+Modify `backend/services/calc_service.py`:
+
+```python
+import logging
+import time
+from typing import Any
+
+from api.core.Auth import AlterState
+from core.basic.character import createCharacter
+
+
+logger = logging.getLogger('dcalc.calc')
+
+
+def calculate(state: AlterState, config: dict[str, Any] | None) -> dict[str, Any]:
+    started_at = time.perf_counter()
+    safe_config = config or {}
+    character = createCharacter(state.alter, state.equVersion)
+    created_at = time.perf_counter()
+    result = character.calc(safe_config)
+    finished_at = time.perf_counter()
+    logger.info(
+        'calc completed alter=%s equVersion=%s create_ms=%.2f calc_ms=%.2f total_ms=%.2f',
+        state.alter,
+        state.equVersion,
+        (created_at - started_at) * 1000,
+        (finished_at - created_at) * 1000,
+        (finished_at - started_at) * 1000,
+    )
+    return result
+```
+
+- [ ] **Step 2: 运行 contract 测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/contract/test_calc_contract.py -v
+```
+
+Expected: PASS。响应 data 不新增耗时字段。
+
+- [ ] **Step 3: 手动观察日志**
+
+Run:
+
+```bash
+cd backend && uv run python main.py
+```
+
+Expected: 服务正常启动。发起 `/api/calc` 后可在日志处理器中接入 `dcalc.calc` logger；本任务不要求改变线上日志格式。
+
+- [ ] **Step 4: 提交本任务**
+
+Run:
+
+```bash
+git add backend/services/calc_service.py
+git commit -m "chore: add calc timing logs"
+```
+
+## Task 7：抽取 effect 应用 helper
+
+**Files:**
+
+- Create: `backend/core/basic/character/effect_apply.py`
+- Modify: `backend/core/basic/character/calc_equip.py`
+- Test: `backend/tests/unit/test_effect_apply.py`
+- Test: `backend/tests/golden/test_calc_golden.py`
+
+- [ ] **Step 1: 创建 helper**
+
+Create `backend/core/basic/character/effect_apply.py`:
+
+```python
+from typing import Any
+
+
+def uppercase_attrs(source: Any) -> dict[str, Any]:
+    return {
+        key: value
+        for key, value in source.__dict__.items()
+        if key and key[0].isupper()
+    }
+
+
+def apply_uppercase_attrs(character: Any, source: Any) -> None:
+    character.SetStatus(**uppercase_attrs(source))
+
+
+def execute_effect(effects: Any, key: str, *args: Any) -> bool:
+    fun = effects.execture(key)
+    if fun is None:
+        return False
+    fun(*args)
+    return True
+```
+
+- [ ] **Step 2: 添加 helper 测试**
+
+Create `backend/tests/unit/test_effect_apply.py`:
+
+```python
+from core.basic.character.effect_apply import uppercase_attrs
+
+
+class Source:
+    STR = 10
+
+    def __init__(self):
+        self.INT = 20
+        self.name = 'ignored'
+
+
+def test_uppercase_attrs_returns_only_uppercase_keys():
+    assert uppercase_attrs(Source()) == {'INT': 20}
+```
+
+- [ ] **Step 3: 在 calc_equip.py 中逐步替换重复代码**
+
+Modify selected occurrences in `backend/core/basic/character/calc_equip.py`:
+
+```python
+from .effect_apply import apply_uppercase_attrs, execute_effect, uppercase_attrs
+```
+
+将简单重复片段：
+
+```python
+filtered_dict = {k: v for k, v in suit.__dict__.items() if k[0].isupper()}
+self.SetStatus(**filtered_dict)
+```
+
+替换为：
+
+```python
+apply_uppercase_attrs(self, suit)
+```
+
+将：
+
+```python
+fun = effects.execture(f'equ_{equ.id}')
+if fun is None:
+    continue
+filtered_dict = {k: v for k, v in equ.__dict__.items() if k[0].isupper()}
+self.SetStatus(**filtered_dict)
+fun(self)
+```
+
+替换为：
+
+```python
+fun = effects.execture(f'equ_{equ.id}')
+if fun is None:
+    continue
+apply_uppercase_attrs(self, equ)
+fun(self)
+```
+
+- [ ] **Step 4: 运行测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest backend/tests/unit/test_effect_apply.py backend/tests/golden/test_calc_golden.py -v
+```
+
+Expected: PASS。
+
+- [ ] **Step 5: 提交本任务**
+
+Run:
+
+```bash
+git add backend/core/basic/character/effect_apply.py backend/core/basic/character/calc_equip.py backend/tests/unit/test_effect_apply.py
+git commit -m "refactor: extract character effect helpers"
+```
+
+## Task 8：补充 backend README
+
+**Files:**
+
+- Create or Modify: `backend/README.md`
+
+- [ ] **Step 1: 编写 backend README**
+
+Create or Modify `backend/README.md`:
+
+````markdown
+# dcalc backend
+
+## Run
+
+```bash
+uv sync
+python main.py
+```
+
+## Test
+
+```bash
+uv run pytest -v
+```
+
+## Quality
+
+```bash
+uv run ruff check .
+```
+
+## Runtime Entry
+
+- `main.py`: FastAPI application and uvicorn entry.
+- `api/routes/calc.py`: `/api/calc` HTTP route.
+- `services/calc_service.py`: calculation orchestration.
+- `core/basic/character/`: character calculation implementation.
+- `core/basic/equipment.py`: equipment data models and compatibility access.
+- `core/basic/equipment_registry.py`: equipment version registry and cache.
+- `database/connect.py`: SQLite and Redis connections.
+
+## Compatibility Rules
+
+- Do not change `/calc` request and response contract without frontend migration approval.
+- Do not change frontendNew result data shape during backend refactors.
+- Keep Skill and Forge business formulas behavior-compatible unless a dedicated formula task says otherwise.
+````
+
+- [ ] **Step 2: 运行文档相关检查**
+
+Run:
+
+```bash
+cd backend && uv run ruff check .
+```
+
+Expected: PASS，或只出现既有遗留问题。若有既有问题，不在本任务做大范围修复。
+
+- [ ] **Step 3: 提交本任务**
+
+Run:
+
+```bash
+git add backend/README.md
+git commit -m "docs: document backend runtime structure"
+```
+
+## Task 9：阶段性全量验证
+
+**Files:**
+
+- No source changes expected.
+
+- [ ] **Step 1: 运行测试**
+
+Run:
+
+```bash
+cd backend && uv run pytest -v
+```
+
+Expected: PASS。
+
+- [ ] **Step 2: 运行 lint**
+
+Run:
+
+```bash
+cd backend && uv run ruff check .
+```
+
+Expected: PASS，或输出仅包含已登记的遗留问题。
+
+- [ ] **Step 3: 启动服务**
+
+Run:
+
+```bash
+cd backend && uv run python main.py
+```
+
+Expected: 输出 `Application startup complete.`，服务监听 `config.PORT`。
+
+- [ ] **Step 4: 手动验证 frontendNew 链路**
+
+Run:
+
+```bash
+cd frontendNew && pnpm dev
+```
+
+Expected: 在 Character 模块修改 Skill/Forge 配置后，仍满足 `config 变化 -> result.execute -> saveConfig`。
+
+- [ ] **Step 5: 提交验证记录**
+
+Run:
+
+```bash
+git status --short
+```
+
+Expected: 工作区干净，所有阶段任务已独立提交。
diff --git a/images b/images
index 0991b6ef..051a7cde 160000
--- a/images
+++ b/images
@@ -1 +1 @@
-Subproject commit 0991b6efa48212464d9e7ca4ba4181000f7236db
+Subproject commit 051a7cde33414d251d901b0a553fb592b46247ee