feat(catalog): add tenant-scoped product attributes and variant definitions

app/Domains/Catalog/Resources/ProductAttributeOptionResource.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Domains\Catalog\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin \App\Domains\Catalog\Models\ProductAttributeOption
+ */
+class ProductAttributeOptionResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'label' => $this->label,
+            'sort_order' => $this->sort_order,
+            'metadata' => $this->metadata,
+        ];
+    }
+}

app/Domains/Catalog/Resources/ProductAttributeResource.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Domains\Catalog\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/**
+ * @mixin \App\Domains\Catalog\Models\ProductAttribute
+ */
+class ProductAttributeResource extends JsonResource
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'tenant_codigo' => $this->tenant_codigo,
+            'codigo' => $this->codigo,
+            'nombre' => $this->nombre,
+            'is_required' => $this->is_required,
+            'metadata_schema' => $this->metadata_schema,
+            'type' => $this->type?->value ?? $this->type,
+            'options' => ProductAttributeOptionResource::collection($this->whenLoaded('options')),
+        ];
+    }
+}