Christian Mueller e88ab3ab08 feat: background device status check every 240s instead of on page load
- Add online, leds, version, last_check columns to wled_devices table
- Background job checks all WLED devices every 4 minutes
- Initial check on startup
- Devices page reads status from DB (instant page load)
- 'Alle jetzt pruefen' button triggers manual check

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-23 23:03:12 +02:00
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