Make all packages required (no optional packages)

Moved all packages from OPTIONAL_PACKAGES to REQUIRED_PACKAGES:
- rsync, mosquitto, python3-paho-mqtt
- mobile-broadband-provider-info, zerotier-one
- gpsd, gpsd-clients

Deploy will now fail if any package is missing, ensuring all
van-* services have their dependencies available.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

deploy.sh

@@ -58,16 +58,16 @@ REQUIRED_PACKAGES=(
     python3-bleak
     modemmanager
     usb-modeswitch
-)
-OPTIONAL_PACKAGES=(
-    rsync
-    mosquitto
     gpsd
     gpsd-clients
+    rsync
+    mosquitto
     python3-paho-mqtt
     mobile-broadband-provider-info
     zerotier-one
 )
+OPTIONAL_PACKAGES=(
+)
 for pkg in "${REQUIRED_PACKAGES[@]}"; do
     dpkg -s "$pkg" >/dev/null 2>&1 || { echo "MISSING REQUIRED: $pkg (apt install $pkg)"; exit 1; }
 done