Configure silent boot for clean boot experience
- Add configure-silent-boot.sh script to configure minimal boot output
- Adds kernel parameters: quiet, loglevel=3, rd.systemd.show_status=auto,
rd.udev.log_level=3, vt.global_cursor_default=0
- Creates /etc/kernel/cmdline for persistent configuration across kernel upgrades
- Configures systemd to show only errors during boot
- Updates bootstrap script to apply silent boot configuration
This provides a clean, minimal boot experience with no console noise,
matching the overall aesthetic of the system setup.