feat: consolidate frontend API layer, add query-client, and harden backend Fase 1

Frontend:
- Consolidate duplicate API layers into single src/lib/axios.ts per app
- Remove src/lib/api-client.ts and src/utils/api.ts (admin)
- Add src/lib/query-client.ts with TanStack Query config per app
- Update all imports and auto-import config

Backend:
- Fix organisations.billing_status default to 'trial'
- Fix user_invitations.invited_by_user_id to nullOnDelete
- Add MeResource with separated app_roles and pivot-based org roles
- Add cross-org check to EventPolicy view() and update()
- Restrict EventPolicy create/update to org_admin/event_manager (not org_member)
- Attach creator as org_admin on organisation store
- Add query scopes to Event and UserInvitation models
- Improve factories with Dutch test data
- Expand test suite from 29 to 41 tests (90 assertions)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Http/Controllers/Api/V1/MeController.php

@@ -5,7 +5,7 @@ declare(strict_types=1);
 namespace App\Http\Controllers\Api\V1;
 
 use App\Http\Controllers\Controller;
-use App\Http\Resources\Api\V1\UserResource;
+use App\Http\Resources\Api\V1\MeResource;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 
@@ -13,8 +13,8 @@ final class MeController extends Controller
 {
     public function __invoke(Request $request): JsonResponse
     {
-        $user = $request->user()->load(['organisations', 'events']);
+        $user = $request->user()->load(['organisations', 'roles', 'permissions']);
 
-        return $this->success(new UserResource($user));
+        return $this->success(new MeResource($user));
     }
 }