oh my opencode

update prompt

update oh my opencode config: ~/.config/opencode/oh-my-opencode.json

adapt to fix the latest schema: "$schema": "https://raw.githubusercontent.com/code-yeongyu/oh-my-opencode/master/assets/oh-my-opencode.schema.json"

and select suitable model from openrouter, if one field has an older config, comment it, and replace it with new one

I have already installed latest opencode and oh-my-opencode, reference document: https://raw.githubusercontent.com/code-yeongyu/oh-my-opencode/refs/heads/master/docs/guide/installation.md