chore(tenpayv3): 新增基于 .NET Framework 4.7 的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net6/Models/CreateRefundRequest.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-
-namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Models
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample.Models
 {
     public class CreateRefundRequest
     {
@@ -11,7 +6,8 @@ namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Models
 
         public string TransactionId { get; set; } = default!;
 
-        // NOTICE: 单机演示时金额来源于客户端请求，生产项目请替换成服务端获取生成
+        // NOTICE:
+        //   单机演示时金额来源于客户端请求，生产项目请改为服务端计算生成，切勿依赖客户端提供的金额结果。
         public int OrderAmount { get; set; }
 
         public int RefundAmount { get; set; }