port to Pi 4 'wan': onboard eth0+wlan0 as NM WANs, AP stack verbatim

The USB hub (5GHz + 2.4GHz AP dongles, Starlink + LAN RTL8153s) moves over
from wayback; MAC-derived wlx*/enx* names travel with it, so hostapd/
networkd/cockpit configs are unchanged. Pi diffs only: failover WAN list
(wlan0 wifi 100, eth0 150, starlink USB 200, Koodo 300), cpu_thermal
sensor, bcm2835 watchdog 10s, no HA DNAT/lease, and deploy.sh drops
battery/lid/heartbeat/ZT-dns. Netplan reference in ap/50-van-wan.yaml.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

power/thermal-config.json

@@ -6,7 +6,12 @@
   "pushover_level": "warn",
   "credentials_path": "/etc/van-battery/pushover.json",
   "sensors": [
-    { "name": "cpu",  "hwmon": "coretemp", "label": "Package id 0", "warn": 80, "crit": 95, "clear_margin": 5 },
-    { "name": "nvme", "hwmon": "nvme",     "label": "Composite",    "warn": 65, "crit": 70, "clear_margin": 5 }
+    {
+      "name": "cpu",
+      "hwmon": "cpu_thermal",
+      "warn": 80,
+      "crit": 85,
+      "clear_margin": 5
+    }
   ]
 }