Add ProductVariant model and migration for productos_variantes table

database/migrations/2026_06_24_000200_create_productos_variantes_table.php

@@ -0,0 +1,39 @@
+<?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', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('producto_id');
+            $table->string('slug')->nullable();
+            $table->string('nombre')->nullable();
+            $table->unsignedInteger('stock')->default(0);
+            $table->text('descripcion')->nullable();
+            $table->decimal('precio', 10, 2);
+            $table->timestamps();
+
+            $table->foreign('producto_id')
+                ->references('id')
+                ->on('productos')
+                ->cascadeOnUpdate()
+                ->cascadeOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('productos_variantes');
+    }
+};