VoxIP Kiosk OS 1.0.0: Raspberry Pi kiosk with web management

Chromium kiosk without a desktop for the Raspberry Pi 3, a Flask web
interface on port 8080 (kiosk, system and network management), a
restricted root helper, network changes with automatic rollback, a
healthcheck timer, install/update/uninstall scripts and a pi-gen image
build.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

systemd/voxip-kiosk-healthcheck.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=VoxIP Kiosk healthcheck (elke minuut)
+
+[Timer]
+OnBootSec=2min
+OnUnitActiveSec=1min
+AccuracySec=10s
+
+[Install]
+WantedBy=timers.target