Add todo

apps/app/src/server/routes/attachment/get.ts

@@ -173,6 +173,7 @@ export const getRouterFactory = (crowi: Crowi): Router => {
   const router = express.Router();
 
   // note: retrieveAttachmentFromIdParam requires `req.params.id`
+  // TODO: https://redmine.weseek.co.jp/issues/166911
   router.get<{ id: string }>('/:id([0-9a-z]{24})',
     certifySharedPageAttachmentMiddleware,
     loginRequired,