feat(telegram): /commands shows inline keyboard button picker with Use/Cancel

[SoRcKwYo]

What does this PR do?

On Telegram, /commands now shows an interactive inline keyboard instead of a plain-text list. Each command appears as a tappable button. Tapping a button shows its description with ▶ Use and ✗ Cancel options — tapping Use dispatches the command directly; tapping Cancel returns to the picker. Pagination (◄ Prev / Next ►) edits the original message in-place rather than sending new messages.

Non-Telegram platforms (Discord, CLI) retain the existing text-based paginated output.

Type of Change

• ✨ New feature (non-breaking change that adds functionality)

Changes Made

• gateway/platforms/telegram.py: add send_commands_picker() with inline keyboard and in-place pagination via edit_message_text; add _handle_commands_picker_callback() handling mc: (show description + Use/Cancel), cu: (dispatch synthetic command event), cc: (back to picker), cp: (page flip); route new callbacks in _handle_callback_query; add _commands_picker_state dict to __init__.
• gateway/run.py: _handle_commands_command() detects Telegram platform and delegates to send_commands_picker() instead of returning a text response.

How to Test

1. Start the gateway with a configured Telegram bot token.
2. Send /commands to the bot.
3. Verify: an inline keyboard appears with up to 8 command buttons per page (2 per row).
4. Tap any button → same message updates to show description + ▶ Use and ✗ Cancel buttons.
5. Tap ▶ Use → message shows "▶ Running /cmd…" and the command executes.
6. Tap ✗ Cancel → returns to the command list page.
7. Tap Next ► / ◄ Prev → same message updates in-place (no new message sent).
8. On a non-Telegram platform (e.g. hermes -q /commands), verify the text list still works.

Checklist

• My commit messages follow Conventional Commits
• My PR contains only changes related to this fix/feature
• I've tested on my platform: macOS