New packages:
- secubox-app-backup: Unified backup for LXC containers, UCI config, services
- luci-app-backup: KISS dashboard with container list and backup history
- secubox-app-mailserver: Custom Postfix+Dovecot in LXC with mesh backup
Enhanced dnsctl with:
- generate: Auto-create subdomain A records
- suggest: Name suggestions by category
- mail-setup: MX, SPF, DMARC record creation
- dkim-add: DKIM TXT record management
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>