refactor(user-journal): 重构用户期刊关联逻辑，移除枚举依赖并新增二维码功能

1.  删除不再使用的UserJournalTypeEnum枚举
2.  将UserJournal实体的Type字段改为int类型并移除枚举依赖
3.  移除BindJournal相关接口的类型参数校验和赋值逻辑
4.  新增二维码生成和上传功能，为用户期刊绑定QrCodeUrl字段
5.  修复UserAnswerTaskController的用户ID获取逻辑
6.  调整UserJournalQrCodeOutput的字段映射，替换QrCodeContent为QrCodeUrl

QYZH.InteractiveMagazine.Models/Entity/UserJournal.cs

@@ -31,12 +31,18 @@ namespace QYZH.InteractiveMagazine.Models.Entity
         public long JournalId { get; set; }
 
         /// <summary>
-        /// Desc:关联类型: Read(已读), Favorite(收藏), Subscribe(订阅)
-        /// Default:Read
+        /// Desc:关联类型: 默认0
         /// Nullable:False
         /// </summary>           
         [SugarColumn(ColumnName = "Type")]
-        public UserJournalTypeEnum Type { get; set; }
+        public int Type { get; set; } = 0;
 
+        /// <summary>
+        /// Desc:二维码地址
+        /// Default:
+        /// Nullable:True
+        /// </summary>
+        [SugarColumn(ColumnName = "QrCodeUrl")]
+        public string? QrCodeUrl { get; set; }
     }
 }