refactor: 统一业务异常处理，标准化结果码和错误响应

1.  新增并完善ResultCode枚举，补充标准HTTP状态码对应的业务状态码
2.  重构BusinessException，新增基于ResultCode的构造函数和ThrowIf扩展方法
3.  替换所有硬编码的HTTP状态码为统一的ResultCode枚举
4.  优化全局异常中间件，根据业务状态码映射对应HTTP状态码并规范化JSON响应
5.  修复OssImageHelper和AutoDotCodeConsumer中的OSS文件处理逻辑
6.  新增用户答题快照实体类
7.  清理废弃的宠物模块迁移脚本

QYZH.InteractiveMagazine.Models/Common/BusinessException.cs

@@ -1,3 +1,5 @@
+using QYZH.InteractiveMagazine.Models.Dto;
+
 namespace QYZH.InteractiveMagazine.Models.Common;
 
 /// <summary>
@@ -10,6 +12,11 @@ public class BusinessException : Exception
     /// </summary>
     public int Code { get; set; }
 
+    /// <summary>
+    /// 业务状态码
+    /// </summary>
+    public ResultCode ResultCode { get; set; } = ResultCode.FAIL;
+
     /// <summary>
     /// 无参构造函数
     /// </summary>
@@ -33,6 +40,18 @@ public class BusinessException : Exception
     public BusinessException(string message, int code) : base(message)
     {
         Code = code;
+        ResultCode = System.Enum.IsDefined(typeof(ResultCode), code) ? (ResultCode)code : ResultCode.FAIL;
+    }
+
+    /// <summary>
+    /// 构造函数（按业务状态码）
+    /// </summary>
+    /// <param name="message">异常消息</param>
+    /// <param name="resultCode">业务状态码</param>
+    public BusinessException(string message, ResultCode resultCode) : base(message)
+    {
+        ResultCode = resultCode;
+        Code = (int)resultCode;
     }
 
     /// <summary>
@@ -62,4 +81,15 @@ public class BusinessException : Exception
             throw new BusinessException(message);
         }
     }
+
+    /// <summary>
+    /// 条件抛出业务异常（带业务状态码）
+    /// </summary>
+    /// <param name="isTrue">是否触发</param>
+    /// <param name="message">异常消息</param>
+    /// <param name="resultCode">业务状态码</param>
+    public static void ThrowIf(bool isTrue, string message, ResultCode resultCode)
+    {
+        if (isTrue) throw new BusinessException(message, resultCode);
+    }
 }

QYZH.InteractiveMagazine.Models/Dto/BaseResponse.cs

@@ -195,5 +195,23 @@ public enum ResultCode
     FORBIDDEN = 403,
 
     [Description("Bad Request")]
-    BAD_REQUEST = 400
+    BAD_REQUEST = 400,
+
+    [Description("资源不存在")]
+    NOT_FOUND = 404,
+
+    [Description("冲突/重复提交")]
+    CONFLICT = 409,
+
+    [Description("业务规则校验失败")]
+    UNPROCESSABLE_ENTITY = 422,
+
+    [Description("请求过于频繁")]
+    TOO_MANY_REQUESTS = 429,
+
+    [Description("第三方服务异常")]
+    BAD_GATEWAY = 502,
+
+    [Description("服务不可用")]
+    SERVICE_UNAVAILABLE = 503
 }

QYZH.InteractiveMagazine.Models/Entity/JournalPageTaskUserAnswerSnapshot.cs

@@ -0,0 +1,161 @@
+using SqlSugar;
+
+namespace QYZH.InteractiveMagazine.Models.Entity
+{
+    /// <summary>
+    /// Snapshot record for a user answer.
+    /// </summary>
+    [SugarTable("JournalPageTaskUserAnswerSnapshot")]
+    public class JournalPageTaskUserAnswerSnapshot : SqlSugarBaseEntity
+    {
+        /// <summary>
+        /// Source JournalPageTaskUserAnswer record Id.
+        /// </summary>
+        public long JournalPageTaskUserAnswerId { get; set; }
+
+        /// <summary>
+        /// Journal Id.
+        /// </summary>
+        public long JournalId { get; set; }
+
+        /// <summary>
+        /// Journal page Id.
+        /// </summary>
+        public long JournalPageId { get; set; }
+
+        /// <summary>
+        /// Journal page task Id.
+        /// </summary>
+        public long JournalPageTaskId { get; set; }
+
+        /// <summary>
+        /// Journal page task group Id.
+        /// </summary>
+        public long JournalPageTaskGroupId { get; set; }
+
+        /// <summary>
+        /// User Id.
+        /// </summary>
+        public long UserId { get; set; }
+
+        /// <summary>
+        /// Answer result.
+        /// </summary>
+        public string? Result { get; set; }
+
+        /// <summary>
+        /// Points awarded.
+        /// </summary>
+        public float Points { get; set; }
+
+        /// <summary>
+        /// Growth points awarded.
+        /// </summary>
+        public float GrowthPoints { get; set; }
+
+        /// <summary>
+        /// Task score.
+        /// </summary>
+        public float Score { get; set; }
+
+        /// <summary>
+        /// Question answer image URL.
+        /// </summary>
+        public string? QuestionAnswerUrl { get; set; }
+
+        /// <summary>
+        /// Answer image URL.
+        /// </summary>
+        public string? AnswerUrl { get; set; }
+
+        /// <summary>
+        /// Page answer image URL.
+        /// </summary>
+        public string? PageAnswerUrl { get; set; }
+
+        /// <summary>
+        /// Optimistic concurrency revision.
+        /// </summary>
+        public int Revision { get; set; }
+
+        /// <summary>
+        /// Answer status.
+        /// </summary>
+        public int AnswerStatus { get; set; }
+
+        /// <summary>
+        /// Answer start time.
+        /// </summary>
+        public DateTime AnswerStartTime { get; set; }
+
+        /// <summary>
+        /// Answer end time.
+        /// </summary>
+        public DateTime AnswerEndTime { get; set; }
+
+        /// <summary>
+        /// Answer duration in seconds.
+        /// </summary>
+        public int AnswerSeconds { get; set; }
+
+        /// <summary>
+        /// Image recognition result.
+        /// </summary>
+        public int ImageRecognition { get; set; }
+
+        /// <summary>
+        /// Journal page number.
+        /// </summary>
+        public int JournalPageNum { get; set; }
+
+        /// <summary>
+        /// Modify count.
+        /// </summary>
+        public int Modify { get; set; }
+
+        /// <summary>
+        /// Last tag Id.
+        /// </summary>
+        public long LastTag { get; set; }
+
+        /// <summary>
+        /// Dot page number.
+        /// </summary>
+        public int DotPageNum { get; set; }
+
+        /// <summary>
+        /// Page result image URL.
+        /// </summary>
+        public string? PageResultUrl { get; set; }
+
+        /// <summary>
+        /// Question type.
+        /// </summary>
+        public string? Type { get; set; }
+
+        /// <summary>
+        /// Dot page number text.
+        /// </summary>
+        public string? DotPageNo { get; set; }
+
+        /// <summary>
+        /// Page answer dot image URL.
+        /// </summary>
+        public string? PageAnswerDotUrl { get; set; }
+
+        /// <summary>
+        /// Break count.
+        /// </summary>
+        public int BreakCount { get; set; }
+
+        /// <summary>
+        /// Break time records.
+        /// </summary>
+        public string? BreakTimes { get; set; }
+
+        /// <summary>
+        /// Assignment status.
+        /// </summary>
+        public string? AssignmentStatus { get; set; }
+    }
+}