feat: enhance checkout process with cart integration and stock confirmation

app/Domains/Catalog/Models/ProductVariant.php

@@ -85,6 +85,25 @@ class ProductVariant extends Model
         $this->save();
     }
 
+    public function confirmReservedStock(int $amount): void
+    {
+        if ($amount < 0) {
+            throw new \InvalidArgumentException('El monto a confirmar debe ser positivo.');
+        }
+
+        if ($this->stock_real < $amount) {
+            throw new \InvalidArgumentException('No hay suficiente stock real para confirmar la reserva.');
+        }
+
+        if ($this->stock_reservado < $amount) {
+            throw new \InvalidArgumentException('No hay suficiente stock reservado para confirmar la reserva.');
+        }
+
+        $this->stock_real -= $amount;
+        $this->stock_reservado -= $amount;
+        $this->save();
+    }
+
     protected function stockTecnico(): Attribute
     {
         return Attribute::get(fn () => $this->stock_real - $this->stock_reservado);