修改User模块，同步原始代码

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

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations;
+namespace Store.Users.Contracts.Dtos;
+
+/// <summary>按用户名查询账户；仅声明用户名非空。</summary>
+public sealed class UserNameRequest
+{
+    [Required(ErrorMessage = "用户名不能为空")]
+    public string UserName { get; set; } = "";
+}
+
+/// <summary>登录输入；长度、账号是否存在及密码匹配由认证服务处理。</summary>
+public sealed class UserLoginRequest
+{
+    [Required(ErrorMessage = "用户名不能为空")] public string UserName { get; set; } = "";
+    [Required(ErrorMessage = "密码不能为空")] public string Password { get; set; } = "";
+}
+
+/// <summary>按代理编码查询充值二维码。</summary>
+public sealed class UserTopUpQrcodeQuery
+{
+    [Required(ErrorMessage = "代理编码不能为空")] public string AgentCode { get; set; } = "";
+}