Rename every remaining voxip name to daynivo, with a one-time migration

Services (daynivo-kiosk-*, daynivo-network-guard, daynivo-boot-import),
programs in /usr/lib/daynivo-kiosk, folders /etc, /var/lib, /var/log and
/var/cache daynivo-kiosk*, the system user daynivo, DAYNIVO_* settings,
the plymouth theme, network profiles daynivo-eth0/wlan0, the image stage
and its first user daynivoadmin.

install.sh moves a kiosk installed up to 1.2.x over once: old services
stopped and removed, folders moved (configuration, password, browser
profile, logs) with symlinks under the old names, the voxip user renamed
with the same uid, network profiles renamed unless a change awaits
confirmation, and old leftovers removed. Tested by upgrading a configured
1.2.0 installation in a container, and running the install a second time.

Old names keep working where people type or place them: voxip-config.json,
voxip-authorized_keys, voxip-network-reset, voxip-kiosk-ctl, and
VOXIP_DEFAULT_URL / VOXIP_DEVICE_NAME for image builds.

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

systemd/daynivo-kiosk-x.service

@@ -0,0 +1,31 @@
+[Unit]
+Description=Daynivo Kiosk X-server (vt7)
+Documentation=file:///usr/share/doc/daynivo-kiosk/README.md
+After=systemd-user-sessions.service systemd-logind.service
+Conflicts=getty@tty7.service
+StartLimitIntervalSec=600
+StartLimitBurst=10
+
+[Service]
+Type=simple
+User=kiosk
+Group=kiosk
+# A logind session on tty7 gives the kiosk user access to the display and input devices.
+PAMName=login
+TTYPath=/dev/tty7
+TTYReset=yes
+TTYVHangup=yes
+StandardInput=tty
+StandardOutput=journal
+StandardError=journal
+UtmpIdentifier=tty7
+UtmpMode=user
+RuntimeDirectory=daynivo-kiosk-x
+RuntimeDirectoryMode=0700
+ExecStartPre=+/usr/bin/chvt 7
+ExecStart=/usr/lib/daynivo-kiosk/daynivo-kiosk-x
+Restart=always
+RestartSec=3
+
+[Install]
+WantedBy=multi-user.target