修改User模块，同步原始代码

Modules/Store.Users.Contracts/IUserAuthenticationService.cs

@@ -0,0 +1,8 @@
+using Store.Users.Contracts.Dtos;
+namespace Store.Users.Contracts;
+
+/// <summary>用户认证入口，统一供宿主签发登录令牌之前调用。</summary>
+public interface IUserAuthenticationService
+{
+    Task<UserInfo?> Authenticate(string userName, string password, CancellationToken cancellationToken = default);
+}