fix: add GET /users/{username}/profile REST endpoint — AP actor owns /users/{username}

crates/presentation/src/routes.rs

@@ -25,6 +25,9 @@ pub fn router() -> Router<AppState> {
             get(users::get_me_following_list),
         )
         .route("/users/me/top-friends", put(social::put_top_friends))
+        // /users/{username} is owned by the AP router (returns AP actor JSON for federation).
+        // The REST user profile lives at /users/{username}/profile to avoid the conflict.
+        .route("/users/{username}/profile", get(users::get_user))
         .route(
             "/users/{username}/top-friends",
             get(social::get_top_friends_handler),