- Add EscalatedSettings key-value model with static get/set/getBool helpers
- Add settings migration with default values (guest tickets enabled, limits)
- Add guest ticket fields migration (guest_name, guest_email, guest_token)
- Add AdminSettingsController for managing settings via admin panel
- Add GuestTicketController for unauthenticated ticket submission
- Add guest.php routes file (no auth middleware)
- Add settings route to admin.php routes
- Update ServiceProvider to register guest routes and share settings
- Add guest helpers to Ticket model (isGuest, requester_name, requester_email)