feat: 添加期刊二维码管理功能，调整UserJournal的UserId为可空类型

1.  新增数据库脚本修改User表UserId字段为可空
2.  新增期刊二维码CRUD接口与控制器
3.  重构绑定期刊逻辑，优化重复绑定校验
4.  删除冗余的JwtHelper重载方法

QYZH.InteractiveMagazine.IService/IUserJournalService.cs

@@ -30,4 +30,34 @@ public interface IUserJournalService : IBaseService<UserJournal>
     /// <param name="userId">用户Id</param>
     /// <param name="id">绑定记录Id</param>
     Task UnbindJournalAsync(long userId, long id);
+
+    /// <summary>
+    /// 生成期刊二维码记录
+    /// </summary>
+    /// <param name="input">生成输入</param>
+    /// <param name="operatorId">操作人Id</param>
+    /// <returns>二维码记录</returns>
+    Task<UserJournalQrCodeOutput> CreateQrCodeAsync(CreateUserJournalQrCodeInput input, long operatorId);
+
+    /// <summary>
+    /// 分页查询期刊二维码记录
+    /// </summary>
+    /// <param name="input">查询条件</param>
+    /// <returns>分页结果</returns>
+    Task<PageListModel<UserJournalQrCodeOutput>> GetQrCodePageListAsync(UserJournalQrCodeQueryInput input);
+
+    /// <summary>
+    /// 获取期刊二维码详情
+    /// </summary>
+    /// <param name="id">二维码记录Id</param>
+    /// <returns>二维码记录</returns>
+    Task<UserJournalQrCodeOutput> GetQrCodeDetailAsync(long id);
+
+    /// <summary>
+    /// 删除未绑定的期刊二维码记录
+    /// </summary>
+    /// <param name="input">删除输入</param>
+    /// <param name="operatorId">操作人Id</param>
+    /// <returns>是否成功</returns>
+    Task<bool> DeleteQrCodeAsync(DeleteUserJournalQrCodeInput input, long operatorId);
 }