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/FestivalSectionFactory.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Database\Factories;
+
+use App\Models\Event;
+use App\Models\FestivalSection;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/** @extends Factory<FestivalSection> */
+final class FestivalSectionFactory extends Factory
+{
+    /** @return array<string, mixed> */
+    public function definition(): array
+    {
+        return [
+            'event_id' => Event::factory(),
+            'name' => fake()->randomElement([
+                'Horeca',
+                'Backstage',
+                'Overig',
+                'Entertainment',
+                'Security',
+                'Techniek',
+            ]),
+            'type' => 'standard',
+            'sort_order' => fake()->numberBetween(1, 5),
+            'responder_self_checkin' => true,
+            'crew_auto_accepts' => false,
+        ];
+    }
+
+    public function withSortOrder(int $order): static
+    {
+        return $this->state(fn () => ['sort_order' => $order]);
+    }
+
+    public function crossEvent(): static
+    {
+        return $this->state(fn () => ['type' => 'cross_event']);
+    }
+}