Fix PCB API JSON serialization issue

啊鑫

2025-07-10 2c1d75c4e57092eea3c26b925ab76c9fd17de736

 MESApplication/Controllers/Base/DemoController.cs

@@ -28,6 +28,7 @@
        }
        catch (Exception ex)
        {
            throw ex;
            return ResponseResult.ResponseError(ex);
        }
    }