First release.

• Hourly cleanup of old backups: keep newest X, maximum age, always keep at least X
• Locked, failed and running backups are never deleted
• Dry-run mode, extension is disabled after install
• Settings page with the result of the last run
• Deletions are logged in the server activity log (retention: true)
• Tested on Pterodactyl 1.15.1, Wings 1.13.3, Blueprint beta-2026-08