* Add default daily cron job for recyclarr sync
- Create /etc/cron.d/recyclarr file with @daily schedule
- Log output to /root/.config/recyclarr/sync.log
- Uses recommended default schedule from recyclarr docs
- Follows project convention for cron jobs
Implements #10182
* Add notes about daily cron job to recyclarr.json
- Info about automatic daily sync via cron
- Reference to cron file location for customization
- Warning about configuring instances before first sync
* update selfhst icon-URLs to use @master path
Changed all icon URLs in JSON files from 'cdn.jsdelivr.net/gh/selfhst/icons/webp/' to 'cdn.jsdelivr.net/gh/selfhst/icons@master/webp/' for consistency and to ensure the latest icons are referenced.
* added missing icons
