Add Tryton synchronization for CatalogSale

- Add external_id field to CatalogSale model for tracking synced sales
- Create migration 0047 for external_id field
- Add TrytonCatalogSale and TrytonCatalogSaleLine classes for Tryton RPC format
- Add send_catalog_sales_to_tryton() method to SaleTrytonService
- Create CatalogSalesToTrytonView API endpoint (POST)
- Register endpoint at /don_confiao/api/enviar_catalog_sales_a_tryton
- Add test for external_id field functionality
- Catalog sales sync to same Tryton model as Sale (model.sale.sale.create)
- Differentiated by reference 'don_confiao_catalog X' and description 'Venta de catálogo'
- Filters only catalog sales without external_id to avoid duplicates

tienda_ilusion/don_confiao/tests/test_api.py

@@ -129,6 +129,24 @@ class TestAPI(APITestCase, LoginMixin):
         self.assertEqual(line2["quantity"], "3.00")
         self.assertEqual(line2["unit_price"], "5000.00")
 
+    def test_catalog_sale_has_external_id_field(self):
+        """Verifica que CatalogSale tiene el campo external_id"""
+        response = self._create_catalog_sale()
+        content = json.loads(response.content.decode("utf-8"))
+        catalog_sale_id = content["id"]
+
+        catalog_sale = CatalogSale.objects.get(pk=catalog_sale_id)
+        # Debe tener el campo external_id
+        self.assertIsNone(catalog_sale.external_id)
+
+        # Se puede asignar un valor
+        catalog_sale.external_id = "123"
+        catalog_sale.save()
+
+        # Verificar que se guardó
+        catalog_sale.refresh_from_db()
+        self.assertEqual(catalog_sale.external_id, "123")
+
     def test_csv_structure_in_sales_for_tryton(self):
         url = "/don_confiao/api/sales/for_tryton"
         self._create_sale()