refactor: 重构用户与商品模块，统一业务模型与服务

1.  新增用户状态枚举UserStatusEnum，统一用户状态定义
2.  重构用户体系：合并WxUser与User实体为Users实体，统一用户管理
3.  新增微信小程序认证相关服务与控制器，实现一键登录功能
4.  新增商品管理完整服务与控制器，修复商品表字段映射问题
5.  删除冗余的WxUser相关服务与控制器代码
6.  新增Newtonsoft.Json依赖用于微信接口响应解析
7.  清理无用的文件夹引用配置

QYZH.InteractiveMagazine.Service/WeChatAuthService.cs

@@ -0,0 +1,160 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+using QYZH.InteractiveMagazine.Common.Helpers;
+using QYZH.InteractiveMagazine.Infrastructure.Auth;
+using QYZH.InteractiveMagazine.Infrastructure.Cache;
+using QYZH.InteractiveMagazine.IService;
+using QYZH.InteractiveMagazine.IService.Dto;
+using QYZH.InteractiveMagazine.Models.Common;
+using QYZH.InteractiveMagazine.Models.Entity;
+using QYZH.InteractiveMagazine.Models.Settings;
+using QYZH.InteractiveMagazine.Repository;
+
+namespace QYZH.InteractiveMagazine.Service;
+
+/// <summary>
+/// 微信小程序认证服务实现
+/// </summary>
+public class WeChatAuthService(BaseRepository<Users> usersRepository, IConfiguration configuration, ILogger<WeChatAuthService> logger) : BaseRepository<Users>, IWeChatAuthService
+{
+    private const string TokenKeyPrefix = "InteractiveMagazine:WeChatAuth:Token";
+    private const string Code2SessionUrl = "https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code";
+
+    /// <summary>
+    /// 微信小程序一键登录
+    /// </summary>
+    /// <param name="input">登录输入（含微信 code）</param>
+    /// <returns>登录结果（含 Token 和用户信息）</returns>
+    public async Task<WeChatLoginOutput> LoginAsync(WeChatLoginInput input)
+    {
+        logger.LogInformation("微信小程序登录尝试");
+
+        // 参数校验
+        if (string.IsNullOrWhiteSpace(input.Code))
+        {
+            throw new BusinessException("微信登录凭证 code 不能为空", 400);
+        }
+
+        // 获取微信配置
+        var weChatSettings = GetWeChatSettings();
+
+        // 调用微信 code2session 接口
+        var wxResponse = await CallCode2SessionAsync(weChatSettings, input.Code);
+        if (wxResponse == null || wxResponse.ErrCode != 0 || string.IsNullOrWhiteSpace(wxResponse.OpenId))
+        {
+            var errMsg = wxResponse?.ErrMsg ?? "未知错误";
+            logger.LogWarning("微信 code2session 接口调用失败，errcode: {ErrCode}, errmsg: {ErrMsg}", wxResponse?.ErrCode, errMsg);
+            throw new BusinessException($"微信登录失败：{errMsg}", 400);
+        }
+
+        logger.LogInformation("微信 code2session 成功，OpenId: {OpenId}", wxResponse.OpenId);
+
+        // 查询用户是否已存在
+        var user = await usersRepository.GetFirstAsync(u => u.OpenId == wxResponse.OpenId);
+        var isNewUser = user == null;
+
+        if (isNewUser)
+        {
+            // 首次登录，创建新用户
+            user = new Users
+            {
+                Name = $"wx_{wxResponse.OpenId[^8..]}",
+                OpenId = wxResponse.OpenId,
+                UnionId = wxResponse.UnionId,
+                Type = "Normal",
+                Status = "Active",
+                GrowthPoints = 0,
+                Points = 0
+            };
+
+            var insertResult = await usersRepository.Insertable(user).ExecuteReturnIdentityAsync();
+            if (insertResult <= 0)
+            {
+                logger.LogError("创建微信用户失败，OpenId: {OpenId}", wxResponse.OpenId);
+                throw new BusinessException("创建用户失败，请稍后重试", 500);
+            }
+
+            user.Id = insertResult;
+            logger.LogInformation("微信新用户创建成功，UserId: {UserId}, OpenId: {OpenId}", user.Id, wxResponse.OpenId);
+        }
+        else
+        {
+            // 已有用户，校验状态
+            if (user.Status == "Disabled")
+            {
+                logger.LogWarning("微信登录失败，用户已被禁用，UserId: {UserId}, OpenId: {OpenId}", user.Id, wxResponse.OpenId);
+                throw new BusinessException("账号已被禁用，请联系客服", 403);
+            }
+
+            logger.LogInformation("微信老用户登录，UserId: {UserId}, OpenId: {OpenId}", user.Id, wxResponse.OpenId);
+        }
+
+        // 生成 JWT Token
+        var jwtSettings = GetJwtSettings();
+        var token = JwtHelper.GenerateToken((long)user.Id, user.Name, jwtSettings);
+
+        // 缓存 Token 到 Redis
+        await RedisHelper.StringSetAsync($"{TokenKeyPrefix}:{user.Id}", token, TimeSpan.FromMinutes(jwtSettings.ExpiryMinutes));
+
+        return new WeChatLoginOutput
+        {
+            Token = token,
+            UserId = (long)user.Id,
+            UserName = user.Name,
+            OpenId = wxResponse.OpenId
+        };
+    }
+
+    /// <summary>
+    /// 调用微信 code2session 接口
+    /// </summary>
+    private async Task<WxCode2SessionResponse?> CallCode2SessionAsync(WeChatSettings settings, string code)
+    {
+        var url = string.Format(Code2SessionUrl, settings.AppId, settings.AppSecret, code);
+        try
+        {
+            return await HttpHelper.GetAsync<WxCode2SessionResponse>(url);
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "调用微信 code2session 接口异常，URL: {Url}", url);
+            throw new BusinessException("微信服务请求失败，请稍后重试", 500);
+        }
+    }
+
+    /// <summary>
+    /// 获取微信配置
+    /// </summary>
+    private WeChatSettings GetWeChatSettings()
+    {
+        var settings = configuration.GetSection("WeChatSettings").Get<WeChatSettings>();
+        if (settings == null || string.IsNullOrWhiteSpace(settings.AppId) || string.IsNullOrWhiteSpace(settings.AppSecret))
+        {
+            logger.LogError("微信配置不完整，请检查 appsettings.json 中的 WeChatSettings 节点");
+            throw new BusinessException("微信配置不完整，请联系系统管理员", 500);
+        }
+        return settings;
+    }
+
+    /// <summary>
+    /// 获取 JWT 配置
+    /// </summary>
+    private JwtSettings GetJwtSettings()
+    {
+        var jwtSettings = configuration.GetSection("JwtSettings").Get<JwtSettings>()
+            ?? new JwtSettings
+            {
+                Issuer = "QYZH.InteractiveMagazine",
+                Audience = "QYZH.InteractiveMagazine",
+                SecretKey = "your-256-bit-secret-key-here-change-in-production",
+                ExpiryMinutes = 120
+            };
+
+        if (string.IsNullOrWhiteSpace(jwtSettings.SecretKey))
+        {
+            throw new BusinessException("JWT 配置不完整", 500);
+        }
+
+        return jwtSettings;
+    }
+}