feat: implement new payment system with Stripe Elements and PayPal JS SDK

Agent-Logs-Url: https://github.com/dsaub/proyecto-final/sessions/09bd2b8f-753c-4431-816f-eba20606d5a0

Co-authored-by: dsaub <54474838+dsaub@users.noreply.github.com>

tienda/migrations/0005_savedpaymentmethod.py

@@ -0,0 +1,35 @@
+# Generated by Django 6.0.1 on 2026-04-10 06:09
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tienda', '0004_product_stock_stockreservation_stockreservationitem'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='SavedPaymentMethod',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('method_type', models.CharField(choices=[('card', 'Tarjeta'), ('paypal', 'PayPal')], max_length=10)),
+                ('label', models.CharField(max_length=200, verbose_name='Etiqueta')),
+                ('stripe_customer_id', models.CharField(blank=True, default='', max_length=100)),
+                ('stripe_payment_method_id', models.CharField(blank=True, default='', max_length=100)),
+                ('paypal_email', models.CharField(blank=True, default='', max_length=254)),
+                ('paypal_payer_id', models.CharField(blank=True, default='', max_length=100)),
+                ('is_default', models.BooleanField(default=False, verbose_name='Predeterminado')),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='payment_methods', to=settings.AUTH_USER_MODEL)),
+            ],
+            options={
+                'verbose_name': 'Método de pago guardado',
+                'verbose_name_plural': 'Métodos de pago guardados',
+                'ordering': ['-is_default', '-created_at'],
+            },
+        ),
+    ]