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>

tests/Feature/Api/Admin/Setting/SmtpTestMailTest.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\Api\Admin\Setting;
+
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Spatie\Permission\Models\Role;
+use Tests\TestCase;
+
+class SmtpTestMailTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private function admin(): User
+    {
+        Role::firstOrCreate(['name' => 'Full Administrator', 'guard_name' => 'admin']);
+        $admin = User::factory()->create();
+        $admin->assignRole('Full Administrator');
+
+        return $admin;
+    }
+
+    public function test_sends_test_email_to_given_address(): void
+    {
+        $this->actingAs($this->admin(), 'admin')
+            ->postJson('/api/v1/administrator/settings/test-smtp', ['email' => 'ops@example.com'])
+            ->assertOk();
+
+        $messages = app('mail.manager')->mailer('array')->getSymfonyTransport()->messages();
+        $this->assertCount(1, $messages);
+        $this->assertSame('ops@example.com', $messages->first()->getEnvelope()->getRecipients()[0]->getAddress());
+    }
+
+    public function test_rejects_invalid_address(): void
+    {
+        $this->actingAs($this->admin(), 'admin')
+            ->postJson('/api/v1/administrator/settings/test-smtp', ['email' => 'not-an-email'])
+            ->assertUnprocessable();
+    }
+}