- Add _TOPIC_IOS_GPS = 'saltybot/ios/gps' constant
- Subscribe to saltybot/ios/gps in _on_mqtt_connect
- Dispatch to _handle_ios_gps() in _dispatch()
- _handle_ios_gps(): same logic as _handle_gps(), frame_id='ios_gps',
publishes to /saltybot/ios/gps via self._ios_gps_pub
- Add rx/pub/err/last_rx_ts counters for the new topic
- Add /saltybot/ios/gps to rosbridge_params.yaml topics_glob
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>