refactor: 清理平台表述并统一为系统

src/Application/TakeoutSaaS.Application/App/Payments/Commands/CreatePaymentCommand.cs

@@ -30,7 +30,7 @@ public sealed class CreatePaymentCommand : IRequest<PaymentDto>
     public decimal Amount { get; set; }
 
     /// <summary>
-    /// 平台交易号。
+    /// 系统交易号。
     /// </summary>
     public string? TradeNo { get; set; }