Add phone hotspot uplink

Prefer a configured phone hotspot for outbound synchronization, preserve secure write-only credentials, and recover through home WiFi or the local Pi hotspot.

Co-authored-by: Copilot <[email protected]>

deploy/yaris-netwatch.service

@@ -1,11 +1,9 @@
 [Unit]
-Description=yaris-obd network watcher (hotspot -> home WiFi reconnect check)
+Description=yaris-obd phone/home/local hotspot uplink watcher
 After=NetworkManager.service
 Wants=NetworkManager.service
 
 [Service]
 Type=oneshot
-# Retry loop (down AP, rescan, retry connect up to 2x) can take ~80s worst
-# case - default 90s systemd start timeout was too tight a margin.
-TimeoutStartSec=180
-ExecStart=/usr/local/bin/yaris-netwatch.sh
+TimeoutStartSec=120
+ExecStart=/usr/local/bin/yaris-uplink check