更新：允许用户为 OpenAI 兼容的提供程序输入自定义请求头。

[vercen]

在 LLM 配置中添加对自定义请求头的支持。

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ RhythmicWave
❌ fuxiaoming

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[RhythmicWave]

感谢贡献，请签一下CLA