feat: fase 2 backend — crowd types, persons, sections, shifts, invite flow

- Crowd Types + Persons CRUD (73 tests)
- Festival Sections + Time Slots + Shifts CRUD met assign/claim flow (84 tests)
- Invite Flow + Member Management met InvitationService (109 tests)
- Schema v1.6 migraties volledig uitgevoerd
- DevSeeder bijgewerkt met crowd types voor testorganisatie

api/app/Console/Commands/ExpireInvitations.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Console\Commands;
+
+use App\Services\InvitationService;
+use Illuminate\Console\Command;
+
+final class ExpireInvitations extends Command
+{
+    protected $signature = 'invitations:expire';
+
+    protected $description = 'Mark all expired pending invitations as expired';
+
+    public function handle(InvitationService $invitationService): int
+    {
+        $count = $invitationService->expireOldInvitations();
+
+        $this->info("Marked {$count} invitation(s) as expired.");
+
+        return self::SUCCESS;
+    }
+}