Initial commit: Complete MBetter Debian Live ISO build system

- Live-build configuration with SSH, OpenVPN, Xorg, Openbox
- Auto-start MbetterClient on boot with root login enabled
- Minimal Debian installer with customizable root password
- MBetter branding with converted logos from mbet.jpg
- Automated build script with password prompting
- Cleanup script to reset configurations
- Cross-platform USB creation scripts (Windows .bat and Linux .sh)
- Comprehensive README with usage instructions