Add SSL monitoring (Svc, model, cron, UI)

Introduce SSL certificate monitoring: add SslService for fetching/parsing certs and parsing monitor targets, SslCertificate model for storing snapshots and managing monitored targets, and cron/check_ssl.php for scheduled checks. Extend DomainController with many SSL endpoints and helpers (add/refresh/bulk refresh/delete/bulk delete, snapshot handling, formatting, stats, safety checks) and surface SSL data in domain views. Add NotificationService helpers to create/send SSL alerts, update Installer to include new migration, add migration 028 to create ssl_certificates table, bump app version default to 1.1.5, update changelog, and modify routes and templates to include SSL tab and related UI. Logs and basic validation/error handling are included to surface SSL issues and protect default root-target behavior.

database/migrations/README.md

@@ -35,6 +35,11 @@ If upgrading from v1.0.0, these incremental migrations will be applied:
 - `021_add_avatar_field.sql` - User avatar field
 - `022_add_pushover_channel_type.sql` - Pushover notification channel support
 - `023_update_app_version_to_1.1.1.sql` - Update version to 1.1.1
+- `024_add_status_notifications_v1.1.2.sql` - Status notification triggers
+- `025_add_update_system_v1.1.3.sql` - In-app update system
+- `026_update_app_version_v1.1.4.sql` - Update version to 1.1.4
+- `027_add_dns_monitoring.sql` - DNS monitoring tables and settings
+- `028_add_ssl_monitoring.sql` - SSL certificate monitoring table, per-domain toggles, timestamps, and cron settings
 
 **Upgrade via:** Web updater at `/install/update`