feat: enhance checkout process with cart integration and stock confirmation

database/migrations/2026_07_06_130000_add_cart_id_to_compras_table.php

@@ -0,0 +1,33 @@
+<?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::table('compras', function (Blueprint $table) {
+            $table->foreignId('cart_id')
+                ->nullable()
+                ->after('user_id')
+                ->constrained('carritos')
+                ->cascadeOnUpdate()
+                ->nullOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('compras', function (Blueprint $table) {
+            $table->dropConstrainedForeignId('cart_id');
+        });
+    }
+};

database/migrations/2026_07_06_130200_add_deleted_at_to_carritos_table.php

@@ -0,0 +1,28 @@
+<?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::table('carritos', function (Blueprint $table) {
+            $table->softDeletes();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('carritos', function (Blueprint $table) {
+            $table->dropSoftDeletes();
+        });
+    }
+};