opencode filter models by providers

[DavideCarvalho]

With so many providers having deepseek v4 flash, it's hard to know from where this deepseek v4 flash is. I have alibaba, opencode, cline and openrouter and I have to keep rotating the model until I find the one I have credits

Bellow a screenshot from what I see

[juliusmarminge]

Implemented in #8573. The mobile model picker now shows each OpenCode model's upstream provider beneath its name, and searching that provider filters the list. Closing this request as completed.