OTC Bot Entry Watcher V13 Background Relay

Fix:
- Pocket Option is HTTPS.
- Hetzner bot is currently HTTP by IP: https://rsignal.org
- Browser can block direct HTTP fetch from HTTPS page as Mixed Content.
- V13 sends server requests through extension background service worker.

Install:
1. Remove old OTC Bot extension in chrome://extensions.
2. Unzip this archive.
3. Click "Load unpacked".
4. Select folder: pocket-click-watcher-v13-background-relay.
5. Open extension options.
6. Set Server URL: https://rsignal.org
7. Save.
8. Press Ctrl+F5 on Pocket Option.
9. Try entering a trade.

Expected:
- Red "Нет связи с OTC Bot" should disappear after real click.
- Server logs should show POCKET ENTRY DETECTED.
