fix: 换打手继承拼多多订单号；优化后台添加会员提示

backend/view.py

@@ -8644,6 +8644,7 @@ class ZxkfghdsView(APIView):
                     Remark=old_order.Remark,
                     User1ID=old_order.User1ID,     # 商家标识
                     ImageURL=old_order.ImageURL,
+                    ExternalOrderID=old_order.ExternalOrderID,
                     ClubID=getattr(old_order, 'ClubID', None) or 'xq',
                     # 注意：不继承 AssignedID、PlayerID
                 )