feat(admin): star/tags marks, service product-type filter, campaign bulk actions, SMTP test

- Star (is_starred) and colored tags for services, customers, orders, invoices:
  Markable trait, tags/taggables tables, PATCH administrator/marks/{type}/{key},
  tag CRUD, list filters starred / tag_ids[]
- GET administrator/services accepts product_type (falls back to product type
  for legacy rows without services.type)
- Mail campaigns: bulk cancel / retry failed / delete; cancelled campaigns are
  skipped by SendMailCampaignRecipient
- POST administrator/settings/test-smtp sends a test email through the saved
  mail transport

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Http/Controllers/Api/Admin/MailCampaign/MailCampaignController.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Http\Controllers\Api\Admin\MailCampaign;
 
+use App\Http\Controllers\Api\Admin\MailCampaign\Concerns\HandlesCampaignBulkActions;
 use App\Http\Controllers\Controller;
 use App\Jobs\Mail\SendMailCampaignRecipient;
 use App\Models\Customer;
@@ -19,6 +20,8 @@ use Illuminate\Validation\ValidationException;
 
 final class MailCampaignController extends Controller
 {
+    use HandlesCampaignBulkActions;
+
     public function index(Request $request): JsonResponse
     {
         $limit = min((int) $request->get('per_page', 20), 200);