fix: add type annotation for TABLE_EMBEDDING_ENABLED

Author: xcrzh

backend/common/core/config.py

@@ -105,7 +105,7 @@ def SQLALCHEMY_DATABASE_URI(self) -> PostgresDsn | str:
     PG_POOL_RECYCLE: int = 3600
     PG_POOL_PRE_PING: bool = True
 
-    TABLE_EMBEDDING_ENABLED = False
+    TABLE_EMBEDDING_ENABLED: bool = False
     TABLE_EMBEDDING_COUNT: int = 10