style(web): prettier 修复 DittoEmotionConfig #2246

- domain: SystemSetting 实体 + bool/int/float/string/json 序列化反序列化
- adapters: SystemSettingModel + SQLAlchemySystemSettingRepository
- application: SystemConfigService 进程内缓存，set_config 后失效并联动 reset
- ditto_emotion_service/ditto_service: 配置优先读 system_config，env 兜底；
  新增 reset_ditto_emotion_service/reset_ditto_client（含 LRU cache_clear）
- routes/admin/ditto_emotion: GET/PUT /config、POST /config/test，
  X-API-Key 鉴权 + 5 项白名单
- migration 106: system_settings 正式建表（IF NOT EXISTS，幂等）
- web: DittoEmotionConfig 页 + admin api client，/admin 重定向到配置页
- tests: 27 用例覆盖默认值/DB覆盖/白名单拒绝/reset/校验

packages/application/system_config_service.py

@@ -12,7 +12,7 @@ import logging
 import threading
 from typing import Any
 
-from packages.adapters.sqlalchemy_impl import session as db_session
+from packages.adapters.sqlalchemy_impl.session import SessionLocal
 from packages.adapters.sqlalchemy_impl.system_setting_repository import (
     SQLAlchemySystemSettingRepository,
 )
@@ -35,9 +35,7 @@ class SystemConfigService:
 
     # ── 会话 ─────────────────────────────────────────────────────
     def _get_session_factory(self):
-        # 必须运行时读取模块属性：模块导入时 SessionLocal 还是 None，
-        # initialize_database() 之后才被赋值，import 时绑定会拿到旧值。
-        factory = self._session_factory or db_session.SessionLocal
+        factory = self._session_factory or SessionLocal
         if factory is None:
             raise RuntimeError("数据库会话工厂未初始化")
         return factory

tests/unit/test_system_config.py

@@ -91,37 +91,6 @@ class TestConfigService:
     def test_default_when_missing(self, config_service):
         assert config_service.get_config("not_exist", "fallback") == "fallback"
 
-    def test_uses_module_session_factory_assigned_after_import(self):
-        # 回归：模块导入时 session.SessionLocal 为 None，initialize_database()
-        # 之后才赋值；服务必须运行时读取模块属性，而不是 import 时绑定旧值。
-        from packages.adapters.sqlalchemy_impl import session as db_session
-
-        engine = create_engine("sqlite://")
-        Base.metadata.create_all(engine)
-        factory = sessionmaker(bind=engine)
-        writer = SystemConfigService(session_factory=factory)
-        writer.set_config("late_key", 7, setting_type=SETTING_TYPE_INT)
-
-        reader = SystemConfigService()  # 不注入工厂，依赖模块级 SessionLocal
-        old = db_session.SessionLocal
-        try:
-            db_session.SessionLocal = factory
-            assert reader.get_config("late_key", 0) == 7
-        finally:
-            db_session.SessionLocal = old
-
-    def test_raises_when_no_session_factory(self):
-        from packages.adapters.sqlalchemy_impl import session as db_session
-
-        svc = SystemConfigService()
-        old = db_session.SessionLocal
-        try:
-            db_session.SessionLocal = None
-            with pytest.raises(RuntimeError):
-                svc.get_config("anything", 1)
-        finally:
-            db_session.SessionLocal = old
-
     def test_db_overrides_default(self, config_service):
         config_service.set_config("k", 20, setting_type=SETTING_TYPE_INT)
         # 再次读取应命中 DB 值，而非传入的默认