add: mark all notifications as read/unread

fix: anonymous avatar/username

crates/app/src/routes/api/v1/mod.rs

@@ -237,6 +237,10 @@ pub fn routes() -> Router {
             "/notifications/{id}/read_status",
             post(notifications::update_read_status_request),
         )
+        .route(
+            "/notifications/all/read_status",
+            post(notifications::update_all_read_status_request),
+        )
         // community memberships
         .route(
             "/communities/{id}/join",