Adds support for passing `gatewayUrl` as a URL parameter to the WebChat UI, allowing the control-ui to connect to a remote gateway (e.g., VPS) instead of defaulting to localhost. Usage: http://localhost:5173/?gatewayUrl=ws://<vps-ip>:18789&token=<token> Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>