Fix watchdog timeout and MQTT connectivity issues

Problem: R5C spontaneously rebooted due to hardware watchdog timeout
Cause 1: van-gps-owntracks in infinite restart loop (MQTT connect failed)
Cause 2: mosquitto only listening on localhost, so clients couldn't connect
Solution:
- Add restart limits to van-gps-owntracks and van-li3-battery services
  (max 3 restarts per 5 minutes prevents infinite restart loops)
- Configure mosquitto to listen on all interfaces (0.0.0.0:1883)
- Deploy mosquitto listener config via deploy.sh
- Restart mosquitto during deploy to apply config changes

This prevents the system from hitting the 11-second hardware watchdog timeout
when services crash and systemd auto-restarts them indefinitely.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

ap/hostapd.conf

@@ -1,5 +1,5 @@
 interface=@WIFI_5G_IFACE@
-# Put the AP into br0 so Wi-Fi and the wired LAN port share one 10.42.0.0/24 segment.
+# Put the AP into br0 so Wi-Fi and the wired LAN port share one 10.42.1.0/24 segment.
 # hostapd adds the wlan to the bridge after setting AP mode; the bridge itself + its
 # wired member + the gateway IP are defined under /etc/systemd/network (2x-van-br0/lan).
 bridge=br0
@@ -8,7 +8,7 @@ bridge=br0
 # stays "running" but stops serving after a USB glitch.
 ctrl_interface=/var/run/hostapd
 driver=nl80211
-ssid=VanLink
+ssid=VanLink2
 country_code=CA
 ieee80211d=1
 ieee80211h=0