修改User模块，同步原始代码

Modules/Store.Users.Contracts/Dtos/UserFundsRequest.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+namespace Store.Users.Contracts.Dtos;
+
+/// <summary>资金请求；DTO 只声明非空规则，金额、长度和操作规则由服务判断。</summary>
+public sealed class UserFundsRequest
+{
+    [Required(ErrorMessage = "目标账户不能为空")] public string UserName { get; set; } = "";
+    [Required(ErrorMessage = "请求号不能为空")] public string RequestId { get; set; } = "";
+    public decimal Amount { get; set; }
+    /// <summary>积分支持充值、转移；余额支持充值、消费。</summary>
+    [Required(ErrorMessage = "操作类型不能为空")] public string Operation { get; set; } = "";
+    public string? Remark { get; set; }
+}
+
+public sealed record UserFundsResponse(string UserName, decimal Value, string RequestId);