Add Telegram Channel

This skill adds Telegram support to NanoClaw, then walks through interactive setup.

Phase 1: Pre-flight

Check if already applied

Check if src/channels/telegram.ts exists. If it does, skip to Phase 3 (Setup). The code changes are already in place.

Ask the user

Use AskUserQuestion to collect configuration:

AskUserQuestion: Do you have a Telegram bot token, or do you need to create one?

If they have one, collect it now. If not, we'll create one in Phase 3.

Phase 2: Apply Code Changes