[Feature] Custom URL for OpenAI-compatible API

[atmomomo]

Thanks for the great work. Is it possible to support custom URL for OpenAI-compatible API call? thanks.

Problem Description The fixed API endpoint limits integration flexibility and branding opportunities for applications.

Proposed Solution Please add support for custom URLs for API calls to allow integration with user-owned domains and paths.

Additional Context This feature would enable secure, branded interactions with your API through a customized gateway.

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问题描述 请描述您遇到的问题或难题，以及为什么这使得使用软件变得困难或令人沮丧。

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