Rename the Python package to daynivo_kiosk

src/voxip_kiosk -> src/daynivo_kiosk, with every import, the launchers,
install.sh, the Makefile and the manager's gunicorn app path. An upgrade
replaces /usr/lib/voxip-kiosk/python as a whole, so the old package
disappears; tested by upgrading an installation of the previous commit.

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

docs/ARCHITECTURE.md

@@ -180,7 +180,7 @@ daynivo-kiosk-os/
 ├── update.sh                    update met backup van configuratie
 ├── uninstall.sh                 verwijderen (--purge voor alles)
 ├── bin/                         dunne launchers → /usr/lib/voxip-kiosk/
-├── src/voxip_kiosk/             Python-package (alle logica)
+├── src/daynivo_kiosk/             Python-package (alle logica)
 │   ├── config.py                laden/valideren/atomair opslaan
 │   ├── validation.py            gedeelde invoervalidatie
 │   ├── cdp.py                   Chrome DevTools Protocol-client