fix: Proxy console WebSocket through main app for HTTPS compatibility

Browser blocks mixed content (HTTPS page -> HTTP WebSocket on port 5001).
Solution: Route WebSocket through main Flask app which goes through
existing HTTPS reverse proxy.

- Add Flask-SocketIO to main mc-webui app
- WebSocket handler proxies commands to bridge via HTTP
- Remove port 5001 external exposure (no longer needed)
- Remove duplicate title from console header

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -8,8 +8,6 @@ services:
     restart: unless-stopped
     devices:
       - "${MC_SERIAL_PORT}:${MC_SERIAL_PORT}"
-    ports:
-      - "5001:5001"  # Expose for WebSocket console access
     volumes:
       - "${MC_CONFIG_DIR}:/root/.config/meshcore:rw"
     environment: