Remove Cloudflare tunnel; shorten generated admin password to 8 chars.

The tunnel setup is being handled externally. Removed all cloudflared
install/watchdog scripts and config from LAUNCH.bat and usb\. LAUNCH.bat
now shows LAN IP directly. Admin password generator changed from 20-char
hex to 8-char hex for easier first login.

.gitignore

@@ -48,11 +48,6 @@ Desktop.ini
 # Portable USB bundle — track LAUNCH.bat only; runtime output stays local
 /usb/*
 !/usb/LAUNCH.bat
-!/usb/cloudflare/
-/usb/cloudflare/*
-!/usb/cloudflare/SETUP.txt
-!/usb/cloudflare/start-tunnel.ps1
-!/usb/cloudflare/tunnel-config.json
 *.msi
 /cloudflared-windows-amd64.msi