feat: add /models command to switch model from Telegram

[liuxb99]

Feature Request

Add a /models command that lets users switch the active model directly from Telegram, without needing to open the OpenCode desktop app.

Current behavior

Users must use the OpenCode desktop app to change models. There is no way to browse or switch models via the Telegram bot.

Proposed behavior

• /models — Shows an inline menu with favorite and recently used models
• Search button to find models across all providers
• One-tap selection updates the model immediately

Implementation notes

• Uses opencodeClient.config.providers() to fetch available models
• Callback-based inline menu with favorites/recent models
• Model search with text input flow
• Command already implemented in src/bot/commands/models.ts and src/bot/handlers/model.ts

This would be a valuable UX improvement for users who primarily interact with OpenCode through Telegram.

[liuxb99]

Actually the issue is the opposite — config.providers() only returns providers with configured API keys. The desktop app uses provider.list() which returns all available providers including free ones. See the SDK difference:

• config.providers() → GET /config/providers → only configured providers
• provider.list() → GET /provider → all available providers (free + connected)

So the fix is to switch from config.providers() to provider.list() for the model catalog and listing commands.

[grinev]

You can use reply keyboard to change the models

[grinev]

I did not add commands for changing models, agents, and options, as these operations are available through the reply keyboard, and a large number of commands would make them inconvenient to use