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-network-guard.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=VoxIP netwerkherstel bij opstarten (rollback en noodreset)
+Documentation=file:///usr/share/doc/voxip-kiosk/README.md
+DefaultDependencies=no
+After=local-fs.target
+Before=NetworkManager.service network-pre.target shutdown.target
+Wants=network-pre.target
+Conflicts=shutdown.target
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/lib/voxip-kiosk/voxip-kiosk-helper network-boot-guard
+
+[Install]
+WantedBy=multi-user.target