feat: add nvidia provider

fix: config render

fix: /model display name not use fallback

chore: add free gpt5 nano and big pickle in /model

fix: model not display life-free model

fix: fetch active opencode model

feat: add new free provider opencode

feat: auto load free openrouter model

fix: /login provider change

feat: /login local model

init: verspercode v0.1.0