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/UserJournalService.cs

@@ -31,14 +31,14 @@ public class UserJournalService(
         // 校验参数
         if (input.JournalId <= 0|| input.Id <= 0)
         {
-            throw new BusinessException("参数错误，未获取到期刊", 400);
+            throw new BusinessException("参数错误，未获取到期刊", ResultCode.BAD_REQUEST);
         }
         // 校验用户是否存在
         var user = await usersRepository.GetByIdAsync(userId);
         if (user == null || user.IsDeleted)
         {
             logger.LogWarning("绑定期刊失败，用户不存在，UserId: {UserId}", userId);
-            throw new BusinessException("用户不存在", 404);
+            throw new BusinessException("用户不存在", ResultCode.NOT_FOUND);
         }
 
         // 校验期刊是否存在
@@ -46,14 +46,14 @@ public class UserJournalService(
         if (journal == null || journal.IsDeleted)
         {
             logger.LogWarning("绑定期刊失败，期刊不存在，JournalId: {JournalId}", input.JournalId);
-            throw new BusinessException("期刊不存在", 404);
+            throw new BusinessException("期刊不存在", ResultCode.NOT_FOUND);
         }
 
         // 校验期刊状态
         if (journal.Status != (int)JournalStatusEnum.Published)
         {
             logger.LogWarning("绑定期刊失败，期刊未发布，JournalId: {JournalId}, Status: {Status}", input.JournalId, journal.Status);
-            throw new BusinessException("该期刊暂未发布，无法绑定", 400);
+            throw new BusinessException("该期刊暂未发布，无法绑定", ResultCode.UNPROCESSABLE_ENTITY);
         }
 
         // 防重复绑定：同一用户 + 期刊 + 实例 + 类型
@@ -63,7 +63,7 @@ public class UserJournalService(
         if (isExist)
         {
             logger.LogWarning("重复绑定期刊，UserId: {UserId}, JournalId: {JournalId}, Type: {Type}", userId, input.JournalId, input.Type);
-            throw new BusinessException("该期刊已被绑定", 400);
+            throw new BusinessException("该期刊已被绑定", ResultCode.BAD_REQUEST);
         }
 
         // 检查是否为首次绑定期刊（用于激活宠物）
@@ -89,7 +89,7 @@ public class UserJournalService(
         if (!result)
         {
             logger.LogError("绑定期刊失败，写入数据库失败，UserId: {UserId}, JournalId: {JournalId}", userId, input.JournalId);
-            throw new BusinessException("绑定期刊失败，请稍后重试", 500);
+            throw new BusinessException("绑定期刊失败，请稍后重试", ResultCode.GLOBAL_ERROR);
         }
 
         logger.LogInformation("用户绑定期刊成功，UserId: {UserId}, JournalId: {JournalId}, Id: {Id}", userId, input.JournalId, userJournal.Id);
@@ -129,12 +129,12 @@ public class UserJournalService(
 
         if (input.PageIndex <= 0)
         {
-            throw new BusinessException("页码必须大于0", 400);
+            throw new BusinessException("页码必须大于0", ResultCode.BAD_REQUEST);
         }
 
         if (input.PageSize <= 0 || input.PageSize > 100)
         {
-            throw new BusinessException("每页条数必须在1-100之间", 400);
+            throw new BusinessException("每页条数必须在1-100之间", ResultCode.BAD_REQUEST);
         }
 
         RefAsync<int> totalNumber = 0;
@@ -167,21 +167,21 @@ public class UserJournalService(
         if (userJournal == null || userJournal.IsDeleted)
         {
             logger.LogWarning("取消绑定失败，记录不存在，Id: {Id}", id);
-            throw new BusinessException("绑定记录不存在", 404);
+            throw new BusinessException("绑定记录不存在", ResultCode.NOT_FOUND);
         }
 
         // 校验归属权：只能取消自己的绑定
         if (userJournal.UserId != userId)
         {
             logger.LogWarning("取消绑定失败，无权操作，UserId: {UserId}, RecordUserId: {RecordUserId}", userId, userJournal.UserId);
-            throw new BusinessException("无权取消该绑定", 403);
+            throw new BusinessException("无权取消该绑定", ResultCode.FORBIDDEN);
         }
 
         var result = await userJournalRepository.DeleteByIdAsync(id);
         if (!result)
         {
             logger.LogError("取消绑定失败，Id: {Id}", id);
-            throw new BusinessException("取消绑定失败，请稍后重试", 500);
+            throw new BusinessException("取消绑定失败，请稍后重试", ResultCode.GLOBAL_ERROR);
         }
 
         logger.LogInformation("取消期刊绑定成功，UserId: {UserId}, Id: {Id}", userId, id);