Add wimtools and startnet.cmd editor for boot.wim modification

- Added wimtools to offline packages and playbook verification
- Webapp startnet.cmd editor: extract, view, edit, save back to boot.wim
- Uses wimextract/wimupdate for in-place WIM modification
- Dark-themed code editor with tab support and common command reference

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

download-packages.sh

@@ -25,6 +25,7 @@ PLAYBOOK_PACKAGES=(
     unzip
     ufw
     cron
+    wimtools
 )
 
 # Packages installed during autoinstall late-commands (NetworkManager, WiFi, etc.)