Add freemium plans, wallet-billed host notifications, and Pro upgrades.

Host alerts use email/phone on the host record without requiring a Ladill
account link; SMS and over-quota emails debit the org wallet at platform rates.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Frontdesk/VisitCheckInService.php

@@ -144,7 +144,7 @@ class VisitCheckInService
             ['visitor' => $visitor->full_name, 'badge_code' => $visit->badge_code],
         );
 
-        $this->notifications->visitorArrived($visit);
+        $visit->host_notified = $this->notifications->visitorArrived($visit);
         $this->webhooks->dispatch('visit.checked_in', $visit);
     }