[FEAT] Add Custom Model Button for Easier Maintenance

[jiangyouwang6]

Is your feature request related to a problem? / 你想要的功能和什么问题相关？

大模型经常更新，孙老师维护应该也非常困难，希望能增加一个自定义大模型的按钮在程序中

Describe the solution you'd like. / 你想要的解决方案是什么？

类似于chatnext，自定义模型

Describe alternatives you've considered. / 你考虑过的其他方案是什么？

No response

Additional context / 其他信息

No response

[eddieai]

Agree.
Especially since most LLM APIs currently are similar to OpenAI's API. By simply providing a custom model option compatible with the OpenAI API, allowing users to input custom API URL + API key + Model ID, it would support the APIs of most LLMs.

A good reference could be the VS Code extension Claude dev, it includes a feature that allows users to add custom APIs that are compatible with OpenAI:

[eddieai]

Some OpenAI Compatible API that I've used:

• DeepSeek
• Mistral
• Cohere
• Groq