feat: switch marketplace to Archipelago app registry

All app images now pull from 80.71.235.15:3000/archipelago/
instead of Docker Hub / ghcr.io. Insecure registry config
baked into ISO for fresh installs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

image-recipe/build-auto-installer-iso.sh

@@ -1296,6 +1296,15 @@ cat > /mnt/target/etc/hosts <<EOF
 ::1         localhost ip6-localhost ip6-loopback
 EOF
 
+# Configure Archipelago app registry (HTTP, insecure)
+mkdir -p /mnt/target/home/archipelago/.config/containers
+cat > /mnt/target/home/archipelago/.config/containers/registries.conf <<'REGCONF'
+[[registry]]
+location = "80.71.235.15:3000"
+insecure = true
+REGCONF
+chown -R 1000:1000 /mnt/target/home/archipelago/.config
+
 # Copy Archipelago binaries and files
 if [ -d "$BOOT_MEDIA/archipelago/bin" ]; then
     cp -r "$BOOT_MEDIA/archipelago/bin/"* /mnt/target/usr/local/bin/ 2>/dev/null || true