Adds SKIP_SUSPENDED config key and --skip-suspended CLI flag that
excludes suspended accounts (detected via /var/cpanel/suspended/)
from backups. Follows the same pattern as the existing SYSBACKUP
toggle across all layers: config, schedule loader, cron builder,
CLI flag parsing, and WHM UI (table toggle, AJAX handler, form card).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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