fix(persistence): separate retryable rejection errors (#6423)

app/api/endpoints/plugin.py

@@ -57,7 +57,7 @@ from app.api.dependencies.plugin import (
 from app.adapters.external.server import MoviePilotServerHelper
 from app.adapters.external.market import PluginHelper
 from app.adapters.system.plugin.package import PluginPackageManager
-from app.schemas.exception import DatabaseWorkerOverloadedError
+from app.schemas.exception import PersistenceUnavailableError
 from app.runtime.log import logger
 from app.schemas.types import SystemConfigKey
 from app.api.context import get_background_task_registry, resolve_background_task_registry
@@ -893,7 +893,7 @@ async def save_plugin_folders(
             folders,
         )
         return _SchemaResponse(success=True)
-    except DatabaseWorkerOverloadedError:
+    except PersistenceUnavailableError:
         raise
     except Exception as e:
         logger.error(f"[文件夹API] 保存文件夹配置失败: {str(e)}")