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.WorkService/Consumers/AutoDotCodeConsumer.cs

@@ -1,4 +1,5 @@
 using Newtonsoft.Json;
+using QYZH.InteractiveMagazine.Common.Extensions;
 using QYZH.InteractiveMagazine.Infrastructure.OSS;
 using QYZH.InteractiveMagazine.Models.Dto.Journal;
 using QYZH.InteractiveMagazine.Models.Entity;
@@ -65,7 +66,19 @@ public class AutoDotCodeConsumer(IConfiguration configuration,
             var uploadFilePath = uploadPdfDic + uploadFileName;
 
             // 获取上传成功的书籍页码pdf文件
-            var pdfSteam = await httpClientFactory.CreateClient().GetStreamAsync(journalPagePrintDtoMessage.JournalPdfUrl, cancellationToken);
+            var journalPdfKey = journalPagePrintDtoMessage.JournalPdfUrl?.RemoveDomain();
+            if (string.IsNullOrWhiteSpace(journalPdfKey))
+            {
+                logger.LogError("书籍上传的PDF文件地址为空，JournalId: {JournalId}", journalPagePrintDtoMessage.JournalId);
+                return;
+            }
+
+            await using var pdfSteam = ossService.GetObjectStream(journalPdfKey);
+            if (pdfSteam == null)
+            {
+                logger.LogError("获取书籍上传的PDF文件失败，OSS Key: {OssKey}", journalPdfKey);
+                return;
+            }
 
             await using (var fs = new FileStream(uploadFilePath, FileMode.CreateNew, FileAccess.Write))
             {