```

refactor(core,ai): 调整模块导入路径并移除废弃文件

- 修复 scheduler.py 中的导入路径错误，将 reports.service
  改为 reports.services
- 移除废弃的 app/core/background/task_queue.py 文件
- 移除废弃的 app/modules/ai_agent/adapters.py 文件
- 修复 ai_memory/service.py 中的导入路径错误，将
  events.service 改为 events.services
```

app/modules/legacy_mysql/services/service.py

@@ -0,0 +1,18 @@
+from sqlalchemy.orm import Session
+
+from app.modules.legacy_mysql.services.mappers import LegacyMapperMixin
+from app.modules.legacy_mysql.services.project_sync import LegacyProjectSyncMixin
+from app.modules.legacy_mysql.services.query import LegacyQueryMixin
+from app.modules.legacy_mysql.services.task_sync import LegacyTaskSyncMixin
+
+
+class LegacyMySQLService(
+    LegacyTaskSyncMixin,
+    LegacyProjectSyncMixin,
+    LegacyMapperMixin,
+    LegacyQueryMixin,
+):
+    """Read legacy MySQL data and sync projects into the internal ledger."""
+
+    def __init__(self, db: Session | None):
+        self.db = db