🐛(back) manage can-edit endpoint without created room in the ws (#1152)

In a scenario where the first user is editing a docs without websocket
and nobody has reached the websocket server first, the y-provider
service will return a 404 and we don't handle this case in the can-edit
endpoint leading to a server error.

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to
 ### Fixed
 
 - 🌐(frontend) keep simple tag during export #1154
+- 🐛(back) manage can-edit endpoint without created room in the ws
 
 ## [3.4.0] - 2025-07-09