工单 增加 接收服务端推送的新工单，支持 推送增加消息

OrderSupportTicket/ViewModels/ChatMessageViewModel.cs

@@ -153,6 +153,9 @@ public sealed class ChatMessageViewModel : BindableBaseEx
         if (dto == null)
             return;
 
+        SequenceNo = dto.SequenceNo;
+        SenderType = dto.SenderType;
+
         SenderDisplayName = string.IsNullOrWhiteSpace(dto.SenderName)
             ? (IsCustomer ? "我" : "客服")
             : dto.SenderName;