Previously, the `nanobot channels status` command only displayed
WhatsApp channel status, completely omitting Telegram despite it
being fully implemented in the codebase.
Changes:
- Added Telegram channel status display
- Renamed "Bridge URL" column to "Configuration" for better generality
- Show Telegram token (first 10 chars) or "not configured" message
- Added comments to distinguish WhatsApp and Telegram sections
Fixes the issue where users couldn't see Telegram channel status
via CLI, even though the feature was working correctly.
