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/Customer/CustomerController.php

@@ -53,7 +53,7 @@ class CustomerController extends Controller
     {
         $perPage = min((int) $request->get('per_page', 15), 500);
         $paginator = $this->customerRepository
-            ->filter($request->all(), [], ['hosting', 'vps', 'domain'], ['*'], true)
+            ->filter($request->all(), ['tags'], ['hosting', 'vps', 'domain'], ['*'], true)
             ->paginate($perPage);
 
         return $this->paginatedResponse($paginator);