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

database/migrations/2026_06_24_000300_create_productos_attributes_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('productos_attributes', function (Blueprint $table) {
+            $table->id();
+            $table->string('tenant_codigo');
+            $table->string('codigo');
+            $table->string('nombre');
+            $table->boolean('is_required')->default(false);
+            $table->json('metadata_schema')->nullable();
+            $table->string('type');
+            $table->timestamps();
+
+            $table->foreign('tenant_codigo')
+                ->references('codigo')
+                ->on('tenants')
+                ->cascadeOnUpdate()
+                ->cascadeOnDelete();
+
+            $table->unique(['tenant_codigo', 'codigo']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('productos_attributes');
+    }
+};

database/migrations/2026_06_24_000310_create_attribute_options_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('attribute_options', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('attribute_id')->constrained('productos_attributes')->cascadeOnUpdate()->cascadeOnDelete();
+            $table->string('label');
+            $table->unsignedInteger('sort_order')->default(0);
+            $table->json('metadata')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('attribute_options');
+    }
+};

database/migrations/2026_06_24_000320_create_productos_variantes_definiciones_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('productos_variantes_definiciones', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('producto_variante_id');
+            $table->foreignId('attribute_id')->constrained('productos_attributes')->cascadeOnUpdate()->cascadeOnDelete();
+            $table->text('value')->nullable();
+            $table->timestamps();
+
+            $table->foreign('producto_variante_id')
+                ->references('id')
+                ->on('productos_variantes')
+                ->cascadeOnUpdate()
+                ->cascadeOnDelete();
+
+            $table->unique(['producto_variante_id', 'attribute_id'], 'prod_var_def_variant_attr_unique');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('productos_variantes_definiciones');
+    }
+};