Summary

Add customCommands config option to merge user-defined commands with native Clawdbot commands in Telegram's bot menu.

Problem

When Clawdbot starts, it registers native commands (like /status, /reset, /model) via setMyCommands, which replaces any custom commands users had previously registered.

Solution

Add a customCommands array to the Telegram channel config that gets merged with native commands when calling setMyCommands.

Config example:

{
  "channels": {
    "telegram": {
      "customCommands": [
        { "command": "backup", "description": "Git backup" },
        { "command": "generate", "description": "Create an image" },
        { "command": "check_email", "description": "Inbox summary" }
      ]
    }
  }
}

Behavior:

• Native commands enabled (default): Custom commands are merged with native commands
• Native commands disabled: Only custom commands are registered
• No custom commands: Existing behavior unchanged

Changes

• src/config/types.ts: Add TelegramCustomCommand type and customCommands field
• src/config/zod-schema.ts: Add schema validation for custom commands
• src/telegram/bot.ts: Merge native + custom commands in setMyCommands call