希望填加自定义完整API URL的功能

[Jer-y]

Search before asking

• [X] I searched in the issues and found nothing similar.

Motivation

• 目前所有的请求都会被translate.ts添加/v1/chat/completions.
• 这让使用者没有办法用其他API URL（比如Azure Open AI)

Solution

1. 把/v1/chat/completions直接放在utils.ts的defaultAPIURL
2. 将translate.ts中的/v1/chat/completions移除

Alternatives

No response

Anything else?

No response

Are you willing to submit a PR?

• [ ] I'm willing to submit a PR!