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/database/seeders/DevSeeder.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Database\Seeders;
 
+use App\Models\CrowdType;
 use App\Models\Organisation;
 use App\Models\User;
 use Illuminate\Database\Seeder;
@@ -76,5 +77,27 @@ class DevSeeder extends Seeder
         if (!$org->users()->where('user_id', $member->id)->exists()) {
             $org->users()->attach($member, ['role' => 'org_member']);
         }
+
+        // 4. Default Crowd Types for Test Festival BV
+        $crowdTypes = [
+            ['name' => 'Crew', 'system_type' => 'CREW', 'color' => '#3b82f6'],
+            ['name' => 'Vrijwilliger', 'system_type' => 'VOLUNTEER', 'color' => '#10b981'],
+            ['name' => 'Artiest', 'system_type' => 'ARTIST', 'color' => '#8b5cf6'],
+            ['name' => 'Gast', 'system_type' => 'GUEST', 'color' => '#f59e0b'],
+            ['name' => 'Pers', 'system_type' => 'PRESS', 'color' => '#6366f1'],
+        ];
+
+        foreach ($crowdTypes as $ct) {
+            CrowdType::firstOrCreate(
+                [
+                    'organisation_id' => $org->id,
+                    'system_type' => $ct['system_type'],
+                ],
+                [
+                    'name' => $ct['name'],
+                    'color' => $ct['color'],
+                ],
+            );
+        }
     }
 }