BIOMEKKA 1.8.45 OTA

- Added password-protected native ArduinoOTA flashing over the local Wi-Fi network.
- OTA hostname: ***
- Added OTA ready/updating/hostname fields to /status JSON.
- OTA start forces rain, mist, spray, trickle and both heaters OFF.
- Main, small and demist fans remain running in a safe airflow state during upload.
- Successful OTA upload reboots normally; failed OTA resumes habitat control.
- Existing USB flashing remains available as the recovery route.