feat:优化屎山

plugins/SignInPlugin/main.py

@@ -1606,9 +1606,8 @@ class SignInPlugin(PluginBase):
                 return {"success": True, "message": f"城市注册请求已处理: {city}"}
 
             else:
-                return {"success": False, "message": "未知的工具名称"}
+                return None
                 
         except Exception as e:
             logger.error(f"LLM工具执行失败: {e}")
             return {"success": False, "message": f"执行失败: {str(e)}"}
-