冗余代码去除

OpenAuth.WebApi/Controllers/ServiceControllers/ManageController.cs

@@ -883,7 +883,6 @@ namespace OpenAuth.WebApi.Controllers.ServiceControllers
         public async Task<Response<bool>> CallAiModel([FromBody] CallAiModel req)
         {
             return await _app.CallAiModel(req);
-            return  null;
         }
     }
 }