Biomekka 1.8.35

Serial storm control patch.

Changed:
- Added prestorm off / prestorm stop to cancel a running pre-storm build-up.
- storm off now also has storm stop as an alias.
- storm off / storm stop cancels pre-storm and active full storm.
- Added manual timed pre-storm command:
  prestorm <pre_seconds> <storm_seconds>
- Manual timed pre-storm uses the same pre_seconds value for post-storm recovery.
- Existing prestorm command still uses random 3-15 minute build-up and matching recovery.
- Existing storm <seconds> command still starts a full storm immediately.

Examples:
- prestorm 60 180 = 60s pre-storm, 180s storm, 60s recovery.
- prestorm off = cancel only pre-storm build-up.
- storm off = cancel pre-storm or active full storm.

No pin, relay, Goblin command, sensor, MQTT topic, dashboard layout, normal lighting colour, fog duty, humidity threshold, storm lottery, Agent DVR URL, SSH/Ubuntu/Nginx, or Home Assistant discovery changes.