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/routes/console.php

@@ -2,7 +2,10 @@
 
 use Illuminate\Foundation\Inspiring;
 use Illuminate\Support\Facades\Artisan;
+use Illuminate\Support\Facades\Schedule;
 
 Artisan::command('inspire', function () {
     $this->comment(Inspiring::quote());
 })->purpose('Display an inspiring quote');
+
+Schedule::command('invitations:expire')->daily();