Add catalog sale purchase summary endpoint

- Add CatalogSaleSummarySerializer and CatalogSummarySaleLineSerializer
- Add CatalogSaleSummary API view for GET requests
- Register endpoint at /don_confiao/resumen_compra_catalogo_json/<id>
- Add comprehensive test for catalog sale summary
- Include nested customer and product details in response
- Endpoint returns id, date, customer, and lines with products

tienda_ilusion/don_confiao/tests/test_api.py

@@ -86,6 +86,49 @@ class TestAPI(APITestCase, LoginMixin):
         self.assertIn("csv", json_response)
         self.assertGreater(len(json_response["csv"]), 0)
 
+    def test_catalog_sale_summary(self):
+        # Create a catalog sale
+        response = self._create_catalog_sale()
+        content = json.loads(response.content.decode("utf-8"))
+        catalog_sale_id = content["id"]
+
+        # Get the summary
+        url = f"/don_confiao/resumen_compra_catalogo_json/{catalog_sale_id}"
+        response = self.client.get(url)
+
+        # Verify response
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        json_response = json.loads(response.content.decode("utf-8"))
+
+        # Verify structure
+        self.assertIn("id", json_response)
+        self.assertIn("date", json_response)
+        self.assertIn("customer", json_response)
+        self.assertIn("lines", json_response)
+
+        # Verify customer details
+        self.assertEqual(json_response["customer"]["id"], self.customer.id)
+        self.assertEqual(json_response["customer"]["name"], self.customer.name)
+
+        # Verify lines
+        self.assertEqual(len(json_response["lines"]), 2)
+
+        # Verify first line
+        line1 = json_response["lines"][0]
+        self.assertIn("product", line1)
+        self.assertIn("quantity", line1)
+        self.assertIn("unit_price", line1)
+        self.assertEqual(line1["product"]["id"], self.product.id)
+        self.assertEqual(line1["product"]["name"], self.product.name)
+        self.assertEqual(line1["quantity"], "2.00")
+        self.assertEqual(line1["unit_price"], "3000.00")
+
+        # Verify second line
+        line2 = json_response["lines"][1]
+        self.assertEqual(line2["product"]["id"], self.product.id)
+        self.assertEqual(line2["quantity"], "3.00")
+        self.assertEqual(line2["unit_price"], "5000.00")
+
     def test_csv_structure_in_sales_for_tryton(self):
         url = "/don_confiao/api/sales/for_tryton"
         self._create_sale()