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>

routes/api/admin/system.php

@@ -21,6 +21,7 @@ Route::prefix('settings')
         Route::get('/', 'index');
         Route::put('/', 'update');
         Route::post('test-telegram', 'testTelegram');
+        Route::post('test-smtp', 'testSmtp')->middleware('throttle:10,1');
     });
 
 Route::prefix('client-menu')
@@ -163,6 +164,8 @@ Route::prefix('mail-campaigns')
         Route::get('/', 'index')->middleware('perm:mail-campaign.view');
         Route::get('variable-suggestions', 'variableSuggestions')->middleware('perm:mail-campaign.create');
         Route::post('preview', 'preview')->middleware('perm:mail-campaign.create');
+        Route::post('bulk-action', 'bulkAction')->middleware('perm:mail-campaign.create');
+        Route::post('bulk-delete', 'bulkDelete')->middleware('perm:mail-campaign.manager');
         Route::get('{uuid}/preview', 'previewCampaign')->middleware('perm:mail-campaign.view');
         Route::get('{uuid}/logs/{id}', 'showLog')->whereNumber('id')->middleware('perm:mail-campaign.view');
         Route::get('{uuid}', 'show')->middleware('perm:mail-campaign.view');