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/Policies/LocationPolicy.php

@@ -0,0 +1,62 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Policies;
+
+use App\Models\Event;
+use App\Models\Location;
+use App\Models\User;
+
+final class LocationPolicy
+{
+    public function viewAny(User $user, Event $event): bool
+    {
+        return $user->hasRole('super_admin')
+            || $event->organisation->users()->where('user_id', $user->id)->exists();
+    }
+
+    public function create(User $user, Event $event): bool
+    {
+        return $this->canManageEvent($user, $event);
+    }
+
+    public function update(User $user, Location $location, Event $event): bool
+    {
+        if ($location->event_id !== $event->id) {
+            return false;
+        }
+
+        return $this->canManageEvent($user, $event);
+    }
+
+    public function delete(User $user, Location $location, Event $event): bool
+    {
+        if ($location->event_id !== $event->id) {
+            return false;
+        }
+
+        return $this->canManageEvent($user, $event);
+    }
+
+    private function canManageEvent(User $user, Event $event): bool
+    {
+        if ($user->hasRole('super_admin')) {
+            return true;
+        }
+
+        $isOrgAdmin = $event->organisation->users()
+            ->where('user_id', $user->id)
+            ->wherePivot('role', 'org_admin')
+            ->exists();
+
+        if ($isOrgAdmin) {
+            return true;
+        }
+
+        return $event->users()
+            ->where('user_id', $user->id)
+            ->wherePivot('role', 'event_manager')
+            ->exists();
+    }
+}