feat(cart): implement cart management with add, update, and remove item functionalities

database/migrations/2026_06_25_000000_create_carritos_table.php

@@ -0,0 +1,40 @@
+<?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('carritos', function (Blueprint $table) {
+            $table->id();
+            $table->string('tenant_codigo');
+            $table->foreignId('user_id')->nullable()->constrained('users')->cascadeOnUpdate()->cascadeOnDelete();
+            $table->string('guest_token')->nullable();
+            $table->string('status')->default('active');
+            $table->timestamps();
+
+            $table->foreign('tenant_codigo')
+                ->references('codigo')
+                ->on('tenants')
+                ->cascadeOnUpdate()
+                ->cascadeOnDelete();
+
+            $table->unique(['tenant_codigo', 'user_id']);
+            $table->unique(['tenant_codigo', 'guest_token']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('carritos');
+    }
+};

database/migrations/2026_06_25_000010_create_carrito_items_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('carrito_items', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('cart_id')->constrained('carritos')->cascadeOnUpdate()->cascadeOnDelete();
+            $table->unsignedBigInteger('producto_variante_id');
+            $table->unsignedInteger('cantidad');
+            $table->timestamps();
+
+            $table->foreign('producto_variante_id')
+                ->references('id')
+                ->on('productos_variantes')
+                ->cascadeOnUpdate()
+                ->cascadeOnDelete();
+
+            $table->unique(['cart_id', 'producto_variante_id']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('carrito_items');
+    }
+};