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>

tests/test_updater.py

@@ -6,8 +6,8 @@ import tarfile
 
 import pytest
 
-from voxip_kiosk import updater as u
-from voxip_kiosk.config import save_config
+from daynivo_kiosk import updater as u
+from daynivo_kiosk.config import save_config
 
 API = u.RELEASE_API
 BASE = "https://git.example.nl/rothman/daynivo-kiosk-os/releases/download"