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>

src/daynivo_kiosk/manager.py

@@ -55,7 +55,7 @@ def gunicorn_argv(paths: Paths, config: dict) -> list[str]:
     if config["admin_https"]:
         cert, key = ensure_certificate(paths)
         argv += ["--certfile", str(cert), "--keyfile", str(key)]
-    argv.append("voxip_kiosk.web:create_app()")
+    argv.append("daynivo_kiosk.web:create_app()")
     return argv