feat(mcp): available for provider reloading

pkg/provider/tools/loaders/plugin.py

@@ -85,4 +85,8 @@ class PluginToolLoader(loader.ToolLoader):
                     },
                     function_name=function.name,
                     function_description=function.description,
-                )
+                )
+
+    async def shutdown(self):
+        """关闭工具"""
+        pass