[问题/Issue] 章节13：后端llm调用一直失败 #267
Description
1. 遇到问题的章节 / Affected Chapter
13
2. 问题类型 / Issue Type
其他 / Other
3. 具体问题描述 / Problem Description
如何解决呢？
4. 问题重现材料 / Reproduction Materials
5. 补充信息 / Additional Information
No response
确认事项 / Verification
- 我已阅读过相关章节的文档 / I have read the relevant chapter documentation
- 我已搜索过现有的Issues,确认此问题未被报告 / I have searched existing Issues and confirmed this hasn't been reported
- 我已尝试过基本的故障排除(如重启、重新安装依赖等) / I have tried basic troubleshooting (restart, reinstall dependencies, etc.)