- Add lib/sysbackup.sh and lib/sysrestore.sh for system-level
backup and restore of WHM/cPanel config, packages, and cron jobs
- Wire cmd_sysbackup and cmd_sysrestore into bin/gniza
- Add --sysbackup flag to cmd_backup: runs system backup after all
account backups complete
- Add SYSBACKUP schedule config key so cron jobs can include
--sysbackup automatically via build_cron_line()
- Add "Include system backup" toggle to WHM schedule form
- Revert sysbackup toggle from remotes.cgi (belongs in schedules)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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