feat: 增加分页排序与FluentValidation

src/Application/TakeoutSaaS.Application/App/Orders/Handlers/GetOrderByIdQueryHandler.cs

@@ -97,6 +97,7 @@ public sealed class GetOrderByIdQueryHandler(
                 RequestedAt = x.RequestedAt,
                 ProcessedAt = x.ProcessedAt,
                 ReviewNotes = x.ReviewNotes
-            }).ToList()
+            }).ToList(),
+            CreatedAt = order.CreatedAt
         };
 }