feat: harden file sharing and integrity

tests/test_router_contract.py

@@ -10,6 +10,7 @@ from govoplan_files.backend.routes.connector_io import router as connector_io_ro
 from govoplan_files.backend.routes.connector_profiles import router as connector_profiles_router
 from govoplan_files.backend.routes.connector_settings import router as connector_settings_router
 from govoplan_files.backend.routes.folders import router as folders_router
+from govoplan_files.backend.routes.integrity import router as integrity_router
 from govoplan_files.backend.routes.listing import router as listing_router
 from govoplan_files.backend.routes.shares import router as shares_router
 from govoplan_files.backend.routes.spaces import router as spaces_router
@@ -30,6 +31,7 @@ class FilesRouterContractTests(unittest.TestCase):
         workflow_routers = (
             spaces_router,
             folders_router,
+            integrity_router,
             listing_router,
             uploads_router,
             connector_settings_router,
@@ -47,7 +49,7 @@ class FilesRouterContractTests(unittest.TestCase):
         actual = self._operation_keys(router)
 
         self.assertEqual(expected, actual)
-        self.assertEqual(41, len(actual))
+        self.assertEqual(50, len(actual))
         self.assertFalse(
             [operation for operation, count in Counter(actual).items() if count > 1]
         )
@@ -77,6 +79,14 @@ class FilesRouterContractTests(unittest.TestCase):
         self.assertIn((("POST",), "/files/bulk-rename"), routes)
         self.assertIn((("POST",), "/files/transfer"), routes)
 
+    def test_share_lifecycle_routes_are_exposed(self) -> None:
+        routes = {(tuple(sorted(route.methods or ())), route.path) for route in router.routes}
+
+        self.assertIn((("GET",), "/files/{file_id}/shares"), routes)
+        self.assertIn((("POST",), "/files/{file_id}/shares"), routes)
+        self.assertIn((("DELETE",), "/files/{file_id}/shares/{share_id}"), routes)
+        self.assertIn((("GET",), "/files/{file_id}/share-target-options"), routes)
+
     def test_file_listing_exposes_structured_property_filters(self) -> None:
         route = next(
             route