Start /api/v1/offline/sync endpoint

app/routing/routers/api/v1.routes.js

@@ -99,6 +99,9 @@ const index = {
 
         // delete the specified code ref
         '/code/:PageId/:NodeId/delete/:CodiumId': ['controller::api:v1:FormCode.drop_code'],
+
+        // re-sync data when an offline client goes back online
+        '/offline/sync': ['controller::api:v1:Offline.do_sync'],
     },
 }