Extend organization analytics contract and fix test warnings

tests/apps/organization/test_api.py

@@ -70,6 +70,8 @@ class OrganizationApiTest(APITestCase):
             response.data["results"][0]["corporation_scope_label"],
             "Организации ОПК",
         )
+        self.assertEqual(response.data["results"][0]["registry_category"], "opk")
+        self.assertEqual(response.data["results"][0]["registry_category_label"], "ОПК")
         self.assertEqual(response.data["results"][0]["short_name"], "АО «Альфа»")
 
     def test_detail_includes_active_registries(self):
@@ -111,6 +113,8 @@ class OrganizationApiTest(APITestCase):
             response.data["corporation_scope_label"],
             "Госкорпорация «Роскосмос»",
         )
+        self.assertEqual(response.data["registry_category"], "other")
+        self.assertEqual(response.data["registry_category_label"], "Прочие")
         self.assertEqual(
             response.data["general_director"]["full_name"],
             "Иванов Иван Иванович",
@@ -189,6 +193,53 @@ class OrganizationApiTest(APITestCase):
         self.assertEqual(len(response.data["results"]), 1)
         self.assertEqual(response.data["results"][0]["id"], str(rosatom_org.id))
 
+    def test_registry_category_filters_support_snake_and_camel_case(self):
+        opk_org = OrganizationFactory.create(name="АО ОПК")
+        goz_org = OrganizationFactory.create(name="АО ГОЗ", in_275_fz_registry=True)
+        other_org = OrganizationFactory.create(name="АО Прочие")
+
+        opk_register = Register.objects.create(name="Реестр предприятий ОПК")
+        goz_register = Register.objects.create(name="Реестр госкорпорации Росатом ГОЗ")
+        upload = RegisterUpload.objects.create(
+            registry=opk_register,
+            actual_date=date(2026, 4, 1),
+            file_name="registry-category.xlsx",
+            file_hash="registry-category-hash",
+            rows_count=2,
+        )
+        goz_upload = RegisterUpload.objects.create(
+            registry=goz_register,
+            actual_date=date(2026, 4, 1),
+            file_name="registry-category-goz.xlsx",
+            file_hash="registry-category-goz-hash",
+            rows_count=1,
+        )
+
+        RegistryMembershipPeriod.objects.create(
+            registry=opk_register,
+            organization=opk_org,
+            started_at=date(2026, 4, 1),
+            started_by_upload=upload,
+        )
+        RegistryMembershipPeriod.objects.create(
+            registry=goz_register,
+            organization=goz_org,
+            started_at=date(2026, 4, 1),
+            started_by_upload=goz_upload,
+        )
+
+        response = self.client.get("/api/v1/organizations/?registry_category=goz")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual([item["id"] for item in response.data["results"]], [str(goz_org.id)])
+
+        response = self.client.get("/api/v1/organizations/?registryCategory=opk")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual([item["id"] for item in response.data["results"]], [str(opk_org.id)])
+
+        response = self.client.get("/api/v1/organizations/?registry_category=other")
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertIn(str(other_org.id), [item["id"] for item in response.data["results"]])
+
 
 class OrganizationDictionaryApiTest(APITestCase):
     """Tests for organization dictionaries endpoints."""