Add model dropdown for openAI compatible models

[yringler]

I connected my poe.com account (API key) to kilo code, and it worked - very easily.
One thing - when I connect a regular account (eg, gemini or openAI), I have a quick model selector at the bottom of the extension.
With openai compat, I do see the name of the current model, but I can't click it to change models.

In the UI when I connect poe, I do see a list of models, so the information is there.

Direct gemini connection