feat: auto load free openrouter model

fix: rm default choice

fix: openrouter 和 local 切换后加载成了 fallback model list

fix: /login provider change

fix: anthropic model fallback in local /model

feat: /login local model

feat: /login local model

fix: filter real openrouter free model

fix: /model can't display openrouter model

init: verspercode v0.1.0