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>

database/migrations/2026_10_15_000010_create_tags_and_starred_columns.php

@@ -0,0 +1,51 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    private const STARRABLE_TABLES = ['services', 'customers', 'orders', 'invoices'];
+
+    public function up(): void
+    {
+        foreach (self::STARRABLE_TABLES as $table) {
+            if (! Schema::hasColumn($table, 'is_starred')) {
+                Schema::table($table, function (Blueprint $blueprint) {
+                    $blueprint->boolean('is_starred')->default(false)->index();
+                });
+            }
+        }
+
+        Schema::create('tags', function (Blueprint $table) {
+            $table->id();
+            $table->string('title', 50)->unique();
+            $table->string('color', 20);
+            $table->timestamps();
+        });
+
+        Schema::create('taggables', function (Blueprint $table) {
+            $table->foreignId('tag_id')->constrained('tags')->cascadeOnDelete();
+            $table->string('taggable_type', 100);
+            $table->unsignedBigInteger('taggable_id');
+            $table->primary(['tag_id', 'taggable_type', 'taggable_id']);
+            $table->index(['taggable_type', 'taggable_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('taggables');
+        Schema::dropIfExists('tags');
+
+        foreach (self::STARRABLE_TABLES as $table) {
+            if (Schema::hasColumn($table, 'is_starred')) {
+                Schema::table($table, function (Blueprint $blueprint) {
+                    $blueprint->dropIndex(['is_starred']);
+                    $blueprint->dropColumn('is_starred');
+                });
+            }
+        }
+    }
+};