[Feature request] proxy support for curl?

Hello there. Hope you're doing well. Thank you for creating this llm plugin. This plugin of yours suits my workflow better, so thank you very much!

## Description

I'm using [proton-privoxy](https://github.com/walterl/proton-privoxy) because I need to use a proxy through a VPN to access api.openai.com .

I'm writing to see if you're willing to add support for proxy?

## Expected behavior

Currently I can use below:

```bash
curl --proxy http://127.0.0.1:8888 ifconfig.co/json
```

Could you please add some kind of configuration to allow users to use `curl` through a proxy?

Thank you again!

The issue does not name a repository file or test. Start by locating the plugin's OpenAI API request entry point and reviewing how its HTTP client is configured; done means users can configure a proxy for requests to api.openai.com and the behavior is covered by an appropriate verification.

Written by the indexing model from the issue text.