Bug fixes:
- Add ~20 missing fi statements throughout advanced_settings(), check_root(),
arch_check(), ssh_check(), select_os(), start_script(), etc.
- Fix pve_check() missing elif/else/fi structure
- Fix DISK_SIZE unbound variable, initialized before machine type dialog
- Fix error_handler() with ${VMID:-} guard to prevent unbound variable error
Architecture improvement:
- Migrate from send_line_to_vm serial console approach to virt-customize with
a first-boot systemd service, consistent with other VM scripts
- First-boot service handles: clock sync (NTP + HTTP fallback), package
installation, swap setup, and UniFi OS installer execution
New features:
- Root password prompt with confirmation
- SSH public key support
- SSH enabled by default
- Cloud-init password override with user-set password
- Port 11443 readiness check after VM boot
- Elapsed time counter during wait loops
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