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>

config/avahi-voxip.service

@@ -0,0 +1,10 @@
+<?xml version="1.0" standalone='no'?>
+<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
+<service-group>
+  <name replace-wildcards="yes">VoxIP Kiosk Manager op %h</name>
+  <service>
+    <type>_http._tcp</type>
+    <port>8080</port>
+    <txt-record>path=/</txt-record>
+  </service>
+</service-group>