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/Resources/Api/Admin/CustomerResource.php

@@ -22,6 +22,8 @@ class CustomerResource extends JsonResource
             'email_marketing' => (bool) $this->email_marketing,
             'receive_deposit' => (bool) $this->receive_deposit,
             'created_at' => $this->created_at,
+            'is_starred' => (bool) $this->is_starred,
+            'tags'       => $this->whenLoaded('tags'),
         ];
     }
 }