Neue README mit Screenshots + Updater-Dokumentation

- Überarbeitete, bebilderte Readme.md (Features, Installation, Auto-Updater,
  Sicherheit, Troubleshooting, API)
- 7 gerenderte Screenshots unter docs/screenshots/ (Login, Voucher-Erstellung,
  Voucher-Ergebnis, Dashboard, Updater, Wartungsmodus)
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Claude 2026-06-05 19:00:36 +00:00
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