重构数据库连接管理，添加元数据支持

app/main.py

@@ -9,6 +9,8 @@ import app.services.project_info as project_info
 from app.api.v1.router import api_router
 from app.infra.db.timescaledb.database import db as tsdb
 from app.infra.db.postgresql.database import db as pgdb
+from app.infra.db.dynamic_manager import project_connection_manager
+from app.infra.db.metadata.database import close_metadata_engine
 from app.services.tjnetwork import open_project
 from app.core.config import settings
 
@@ -46,6 +48,8 @@ async def lifespan(app: FastAPI):
     # 清理资源
     await tsdb.close()
     await pgdb.close()
+    await project_connection_manager.close_all()
+    await close_metadata_engine()
     logger.info("Database connections closed")