disable fallback on Openrouter

[ofou]

Which version of the app are you using?

4.10.0

Which API Provider are you using?

OpenRouter

Which Model are you using?

Any

What happened?

As reported by users on Reddit and Github, currently, there's no way to disable or manipulate the fallback mechanism in OpenRouter. It'd be nice to add support for that.

It could be implemented with a checkbox in the OpenRouter settings

Steps to reproduce

1. Use OpenRouter provider
2. Try to manipulate the fallback mechanism