feat: add CatalogSale model with abstract base classes for Sale/SaleLine

- Introduced SaleAbstractModel and SaleLineAbstractModel as abstract bases
- Added CatalogSale and CatalogSaleLine models inheriting from them
- Created migration 0045 for new models
- Added CatalogSaleView, CatalogSaleSerializer with nested line creation
- Registered new models in admin
- Added catalog_sales router endpoint to URLs
- Removed placeholder api/ package (now redundant)

tienda_ilusion/don_confiao/migrations/0045_catalogsale_catalogsaleline.py

@@ -0,0 +1,41 @@
+# Generated by Django 5.0.6 on 2026-05-28 21:29
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('don_confiao', '0044_alter_payment_type_payment_alter_sale_payment_method'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CatalogSale',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('date', models.DateTimeField(verbose_name='Date')),
+                ('phone', models.CharField(blank=True, max_length=13, null=True)),
+                ('description', models.CharField(blank=True, max_length=255, null=True)),
+                ('customer', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, to='don_confiao.customer')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='CatalogSaleLine',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('quantity', models.DecimalField(decimal_places=2, max_digits=10, null=True)),
+                ('unit_price', models.DecimalField(decimal_places=2, max_digits=9)),
+                ('description', models.CharField(blank=True, max_length=255, null=True)),
+                ('catalog_sale', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='don_confiao.catalogsale')),
+                ('product', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='don_confiao.product')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]