更新框架，增加云库搜索模块

Store.Services/UserService.cs

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+using FreeSql;
+using MAX.Core.Cryptography;
+using MAX.Core.DependencyInjection;
+using Store.Framework.Models;
+using Store.Framework.Repositorys;
+using StoreHub.Services.Dtos;
+using StoreHub.Services.Mappers;
+
+namespace StoreHub.Services;
+
+/// <summary>
+/// 用户业务服务：登录校验、用户查询等用例。
+/// </summary>
+public interface IUserService
+{
+	/// <summary>
+	/// 校验用户名/密码，成功返回用户 DTO，失败返回 null。
+	/// </summary>
+	Task<UserDto?> LoginAsync(string userName, string password);
+
+	/// <summary>
+	/// 根据用户ID获取用户 DTO，不存在返回 null。
+	/// </summary>
+	Task<UserDto?> GetByIdAsync(int id);
+}
+
+/// <summary>
+/// 用户业务服务实现（<see cref="IScopedDependency"/>，由 AddStoreHub 自动注册）。
+/// </summary>
+public class UserService : IUserService, IScopedDependency
+{
+	private readonly IUserRepository _userRepository;
+
+	public UserService(IUserRepository userRepository)
+	{
+		_userRepository = userRepository;
+	}
+
+	/// <inheritdoc />
+	public async Task<UserDto?> LoginAsync(string userName, string password)
+	{
+		if (string.IsNullOrWhiteSpace(userName) || string.IsNullOrWhiteSpace(password))
+		{
+			return null;
+		}
+		var sql = _userRepository.Where(u => u.UserName == userName).ToSql();
+		User? user = await _userRepository.Where(u => u.UserName == userName).FirstAsync();
+		string pwd = MD5Helper.Md5_32(password);
+		if (user is null || !string.Equals(user.Password, pwd, StringComparison.OrdinalIgnoreCase))
+		{
+			return null;
+		}
+		
+		return UserMapper.ToDto(user);
+	}
+
+	/// <inheritdoc />
+	public async Task<UserDto?> GetByIdAsync(int id)
+	{
+		User? user = await _userRepository.Where(u => u.Id == id).FirstAsync();
+		return user is null ? null : UserMapper.ToDto(user);
+	}
+}
+