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/factories/TimeSlotFactory.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Database\Factories;
+
+use App\Models\Event;
+use App\Models\TimeSlot;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/** @extends Factory<TimeSlot> */
+final class TimeSlotFactory extends Factory
+{
+    /** @return array<string, mixed> */
+    public function definition(): array
+    {
+        return [
+            'event_id' => Event::factory(),
+            'name' => fake()->randomElement([
+                'Vrijdag Avond',
+                'Zaterdag Dag',
+                'Zaterdag Avond',
+                'Zondag',
+                'Opbouw',
+            ]),
+            'person_type' => 'VOLUNTEER',
+            'date' => fake()->dateTimeBetween('+1 month', '+3 months'),
+            'start_time' => '18:00:00',
+            'end_time' => '02:00:00',
+            'duration_hours' => 8.00,
+        ];
+    }
+}