feat(#49): add geolocation (latitude/longitude) to municipalities

- Municipality model with optional latitude/longitude decimal fields
- Municipality and brief serializers expose lat/lng (also in product_provenance of public/authenticated summaries for the Leaflet map)
- seed_geography endpoint reads lat/lng and updates existing municipalities on reseed (idempotent)
- TDD tests for model, serializers, summaries and seed

tienda_ilusion/don_confiao/tests/test_geography_models.py

@@ -68,6 +68,26 @@ class TestMunicipalityModel(TestCase):
         self.assertEqual(municipality.department.country.name, "Colombia")
         self.assertEqual(str(municipality), "La Mesa")
 
+    def test_municipality_geolocation_fields(self):
+        municipality = Municipality.objects.create(
+            name="La Mesa",
+            department=self.department,
+            country=self.country,
+            latitude=4.63092,
+            longitude=-74.39152,
+        )
+        self.assertEqual(municipality.latitude, 4.63092)
+        self.assertEqual(municipality.longitude, -74.39152)
+
+    def test_municipality_geolocation_optional(self):
+        municipality = Municipality.objects.create(
+            name="La Mesa",
+            department=self.department,
+            country=self.country,
+        )
+        self.assertIsNone(municipality.latitude)
+        self.assertIsNone(municipality.longitude)
+
     def test_municipality_requires_department_and_country(self):
         with self.assertRaises(IntegrityError):
             with transaction.atomic():

tienda_ilusion/don_confiao/tests/test_provenance_api.py

@@ -241,6 +241,27 @@ class TestProvenanceCRUD(APITestCase, LoginMixin):
         self.assertEqual(data["country_detail"]["name"], "Colombia")
         self.assertEqual(data["country_detail"]["code"], "CO")
 
+    def test_municipality_serializer_includes_geolocation(self):
+        self.municipality.latitude = 4.63092
+        self.municipality.longitude = -74.39152
+        self.municipality.save()
+        response = self.client.get(
+            f"/don_confiao/api/municipalities/{self.municipality.id}/"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        data = response.json()
+        self.assertEqual(float(data["latitude"]), 4.63092)
+        self.assertEqual(float(data["longitude"]), -74.39152)
+
+    def test_municipality_serializer_geolocation_optional(self):
+        response = self.client.get(
+            f"/don_confiao/api/municipalities/{self.municipality.id}/"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        data = response.json()
+        self.assertIsNone(data["latitude"])
+        self.assertIsNone(data["longitude"])
+
     def test_link_product_to_suppliers_via_product_api(self):
         product = Product.objects.create(name="Panela", price=5000)
         supplier2 = Supplier.objects.create(name="Proveedor 2")
@@ -315,6 +336,37 @@ class TestSeedGeography(APITestCase, LoginMixin):
         self.assertEqual(Department.objects.count(), 1)
         self.assertEqual(Municipality.objects.count(), 2)
 
+    def test_seed_creates_municipality_with_geolocation(self):
+        self.login()
+        payload = self._payload()
+        payload["municipalities"][0] = {
+            "name": "La Mesa",
+            "department": "Cundinamarca",
+            "latitude": 4.63092,
+            "longitude": -74.39152,
+        }
+        response = self.client.post(self.url, payload, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        municipality = Municipality.objects.get(name="La Mesa")
+        self.assertEqual(float(municipality.latitude), 4.63092)
+        self.assertEqual(float(municipality.longitude), -74.39152)
+
+    def test_seed_updates_geolocation_on_reseed(self):
+        self.login()
+        self.client.post(self.url, self._payload(), format="json")
+        payload = self._payload()
+        payload["municipalities"][0] = {
+            "name": "La Mesa",
+            "department": "Cundinamarca",
+            "latitude": 4.63092,
+            "longitude": -74.39152,
+        }
+        response = self.client.post(self.url, payload, format="json")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        municipality = Municipality.objects.get(name="La Mesa")
+        self.assertEqual(float(municipality.latitude), 4.63092)
+        self.assertEqual(float(municipality.longitude), -74.39152)
+
     def test_seed_requires_country_name(self):
         self.login()
         response = self.client.post(

tienda_ilusion/don_confiao/tests/test_provenance_graphs.py

@@ -75,6 +75,23 @@ class TestProvenanceInSummaries(APITestCase, LoginMixin):
         self.assertEqual(supplier["department"]["name"], "Cundinamarca")
         self.assertEqual(supplier["country"]["name"], "Colombia")
 
+    def test_public_summary_municipality_includes_geolocation(self):
+        self.municipality.latitude = 4.63092
+        self.municipality.longitude = -74.39152
+        self.municipality.save()
+        sale = self._create_sale()
+        response = self.client.get(
+            f"/don_confiao/resumen_publico/{sale.code}"
+        )
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        supplier = response.json()["product_provenance"][0]["suppliers"][0]
+        self.assertEqual(
+            float(supplier["municipality"]["latitude"]), 4.63092
+        )
+        self.assertEqual(
+            float(supplier["municipality"]["longitude"]), -74.39152
+        )
+
     def test_public_catalog_summary_includes_product_provenance(self):
         catalog_sale = self._create_catalog_sale()
         response = self.client.get(