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>

tests/conftest.py

@@ -96,7 +96,7 @@ def quiet_system(monkeypatch):
         "available": True, "wifi_country": "NL",
         "devices": {
             iface: {"interface": iface, "kind": kind, "present": True, "state": "connected", "state_label": "Verbonden",
-                    "connected": True, "connection": f"voxip-{iface}", "addresses": ["192.168.10.20/24"], "gateway": "192.168.10.1",
+                    "connected": True, "connection": f"daynivo-{iface}", "addresses": ["192.168.10.20/24"], "gateway": "192.168.10.1",
                     "dns": ["192.168.10.1"], "hwaddr": "B8:27:EB:00:00:01",
                     "profile": {"exists": True, "method": "dhcp", "address": "", "gateway": "", "dns": "", "ssid": "Kantoor", "hidden": False}}
             for iface, kind in (("eth0", "ethernet"), ("wlan0", "wifi"))
@@ -130,7 +130,7 @@ PASSWORD = "Correct-Paard-Batterij-42"
 @pytest.fixture
 def logged_in(app, client, paths):
     """A client with a configured admin password and an active session."""
-    app.extensions["voxip"].credentials.set_password(PASSWORD)
+    app.extensions["daynivo"].credentials.set_password(PASSWORD)
     page = client.get("/login")
     token = csrf_from(page)
     resp = client.post("/login", data={"password": PASSWORD, "csrf_token": token})