- Add chrome-extension/ to Dockerfile COPY (was missing, caused 404 on download)
- Remove UDP Relay tab from admin panel (relay is server-side, no user config needed)
- Remove upload mode toggle buttons, replace with clean inline status bar
- Extension panel: drop relay port-forwarding note, simplify to 'extension required' message
- UDP hint shown inline only when extension is detected in browser
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>