feat: Add transaction code generation for orders and update receipt templates

tienda/templates/tienda/checkout_success.html

@@ -7,6 +7,9 @@
         <div class="alert alert-success p-5">
             <h2 class="mb-3">¡Pago completado!</h2>
             <p class="mb-4">Tu pedido ha sido procesado correctamente.</p>
+            {% if order and order.transaction_code %}
+            <p class="mb-4"><strong>ID de transacción:</strong> {{ order.transaction_code }}</p>
+            {% endif %}
             <a href="{% url 'index' %}" class="btn btn-primary">Volver a la tienda</a>
         </div>
     </div>

tienda/templates/tienda/mis_recibos.html

@@ -34,6 +34,7 @@
                 <thead>
                     <tr>
                         <th>Recibo #</th>
+                        <th>ID Transacción</th>
                         <th>Fecha</th>
                         <th>Total</th>
                         <th>Método</th>
@@ -44,6 +45,7 @@
                     {% for receipt in receipts %}
                     <tr>
                         <td>{{ receipt.id }}</td>
+                        <td>{{ receipt.transaction_code|default:"-" }}</td>
                         <td>{{ receipt.created_at|date:"d/m/Y H:i" }}</td>
                         <td>{{ receipt.total }}€</td>
                         <td>{{ receipt.get_payment_method_display }}</td>