fix: remove sudo from installer (already root), reduce ISOLINUX timeout

- sudo not installed in minbase squashfs — caused "command not found"
  when pressing Enter to install. We're already root via auto-login.
- ISOLINUX timeout from 5s to 1s — reduces menu flicker/duplication

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

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

@@ -536,7 +536,7 @@ if [ -n "\$BOOT_MEDIA" ]; then
     echo ""
     echo "  Press Enter to start installation, or Ctrl+C for shell..."
     read
-    sudo bash "\$BOOT_MEDIA/archipelago/auto-install.sh"
+    bash "\$BOOT_MEDIA/archipelago/auto-install.sh"
 else
     echo "  Installer not found on boot media."
     echo "  Checked: /run/live/medium, /run/archiso, /cdrom, /media/cdrom"
@@ -2556,7 +2556,7 @@ echo "   Writing ISOLINUX config..."
 cat > "$INSTALLER_ISO/isolinux/isolinux.cfg" <<'ISOCFG'
 UI menu.c32
 PROMPT 0
-TIMEOUT 50
+TIMEOUT 10
 
 MENU TITLE ARCHIPELAGO - Bitcoin Node OS
 MENU COLOR screen      37;40   #80ffffff #00000000 std