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/CompanyPolicy.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Policies;
+
+use App\Models\Company;
+use App\Models\Organisation;
+use App\Models\User;
+
+final class CompanyPolicy
+{
+    public function viewAny(User $user, Organisation $organisation): bool
+    {
+        return $user->hasRole('super_admin')
+            || $organisation->users()->where('user_id', $user->id)->exists();
+    }
+
+    public function create(User $user, Organisation $organisation): bool
+    {
+        return $this->canManageOrganisation($user, $organisation);
+    }
+
+    public function update(User $user, Company $company, Organisation $organisation): bool
+    {
+        if ($company->organisation_id !== $organisation->id) {
+            return false;
+        }
+
+        return $this->canManageOrganisation($user, $organisation);
+    }
+
+    public function delete(User $user, Company $company, Organisation $organisation): bool
+    {
+        if ($company->organisation_id !== $organisation->id) {
+            return false;
+        }
+
+        return $this->canManageOrganisation($user, $organisation);
+    }
+
+    private function canManageOrganisation(User $user, Organisation $organisation): bool
+    {
+        if ($user->hasRole('super_admin')) {
+            return true;
+        }
+
+        return $organisation->users()
+            ->where('user_id', $user->id)
+            ->wherePivot('role', 'org_admin')
+            ->exists();
+    }
+}