support any openrouter voice model

[rambip]

Feature Description

Problem / use case:

I used the mistral model from openrouter, and it worked great. I would like to be able to use it from openrouter

Proposed solution:

Check dynamically the supported models once the user has setup its key.
You can get them like so:
https://github.com/rambip/sttui/blob/3287f9f77650dfcdb2254e2c15f38db5bd2be464/src/sttui/transcribe.py#L156

Relevant Platforms

All Platforms

How important is this feature to you?

Important for my use case

Willing to Contribute?

No, but I can test it

Discord Link

No response

Checklist

• I have searched existing issues and this feature hasn't been requested