Feat: OpenAI Base URL supported

[Nothing1024]

The OpenAI Base URL support has been added, and users can use the custom URL. If no input is provided, the official OpenAI URL will be used automatically.

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[abi]

thank you for this. will merge in tomorrow

[abi]

Thanks @Nothing1024 finally merged!

[jackylee1]

The OpenAI Base URL support has been added, and users can use the custom URL. If no input is provided, the official OpenAI URL will be used automatically.

could you specify how to use it .with my local model?

[Nothing1024]

The following instructions may help:

1. Find the Web-UI container that can run your local model.
2. Find the proxy to transform the container's API rules into OpenAI-style API rules.
3. Change your BASE_URL.

[abi]

@jackylee1 you can't use it with your local model yet. This PR is about using it with a OpenAI proxy