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_browser.py

@@ -2,8 +2,8 @@ import json
 from pathlib import Path
 from urllib.parse import parse_qs, urlsplit
 
-from voxip_kiosk import browser as b
-from voxip_kiosk.config import DEFAULTS
+from daynivo_kiosk import browser as b
+from daynivo_kiosk.config import DEFAULTS
 
 XRANDR = """Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 7680 x 7680
 HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm