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.Service/CompensationManageService.cs

@@ -73,10 +73,10 @@ public class CompensationManageService(
 
         var task = await compensationTaskRepository.GetByIdAsync(taskId);
         if (task == null)
-            throw new BusinessException("补偿任务不存在", 404);
+            throw new BusinessException("补偿任务不存在", ResultCode.NOT_FOUND);
 
         if (task.Status != (int)CompensationTaskStatusEnum.Failed && task.Status != (int)CompensationTaskStatusEnum.Cancelled)
-            throw new BusinessException($"只有失败或已取消的任务才能重试，当前状态: {task.Status}", 400);
+            throw new BusinessException($"只有失败或已取消的任务才能重试，当前状态: {task.Status}", ResultCode.BAD_REQUEST);
 
         // 重置任务状态为 Pending，清零重试次数，设置立即执行
         await compensationTaskRepository.Context.Updateable<CompensationTask>()
@@ -116,10 +116,10 @@ public class CompensationManageService(
 
         var task = await compensationTaskRepository.GetByIdAsync(taskId);
         if (task == null)
-            throw new BusinessException("补偿任务不存在", 404);
+            throw new BusinessException("补偿任务不存在", ResultCode.NOT_FOUND);
 
         if (task.Status == (int)CompensationTaskStatusEnum.Success)
-            throw new BusinessException("该任务已经是成功状态，无需标记", 400);
+            throw new BusinessException("该任务已经是成功状态，无需标记", ResultCode.BAD_REQUEST);
 
         // 标记为 Success
         await compensationTaskRepository.Context.Updateable<CompensationTask>()
@@ -184,7 +184,7 @@ public class CompensationManageService(
             .FirstAsync();
 
         if (result == null)
-            throw new BusinessException("补偿任务不存在", 404);
+            throw new BusinessException("补偿任务不存在", ResultCode.NOT_FOUND);
 
         return result;
     }