[Feature Request] 不同的模型（即使同为兼容OpenAI）设置不同的key和url

[bestsanmao]

🥰 Feature Description

现在模型越来越多，大多数新出的模型api都兼容openai，但是不同的模型有不同的key和api url。当前的nextchat如果自定义模型（环境变量中设的自定义模型）设为@openai
就只能使用全局的唯一的一个key和api url

🧐 Proposed Solution

希望能在环境变量设置自定义模型时指定不同的key和api url

📝 Additional Information

No response

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Title: [Feature Request] Different models (even if they are both compatible with OpenAI) set different keys

[StereoApp]

这个真的很刚需，现在越来越多的API转发站一个Key只能调用一类Model。

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This is really needed. Now more and more API forwarding stations can only call one type of Model per Key.

[aniude]

这个 PR #5989 似乎也只是加多一种模型，并没有解决这个 Feature Request 的问题.

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This MR seems to be just adding another model, and it does not solve the problem of this Feature Request.