refactor: route calc through service layer

backend/tests/unit/test_calc_service.py

@@ -0,0 +1,11 @@
+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)