feat: Support openrouter.ai

[a-b]

Thansk for amazing plugin. It would be great if you can support https://openrouter.ai

[briansunter]

This looks interesting. I'll look into this. I've been wanting to add better support for local / other models but haven't looked into all the options for doing that.

I've seen some other models be compatible with the openai request format and those should work out of the box, but it looks like this one has it's own request format. https://openrouter.ai/docs/requests

Is there a particular model or feature from openrouter you were interested in using?