Add smooth support for openrouter

[SpeedySH]

I can connect openrouter via “compatible endpoints,” but the list of models returns about 100 items, if not more, and they all turn on automatically. I spent 5 minutes like an idiot clicking off everything I didn't need. It would be great if there were more models, say 20, to add a search function, as well as change the behavior that turns on all models by default.