Fix friends display name fallback

server/im_http.go

@@ -8539,6 +8539,9 @@ func friendListItemPayload(item types.FriendListItem) map[string]any {
 			}
 		}
 	}
+	if item.Friendship.Remark == "" && data["display_name"] == data["user_id"] {
+		data["display_name_source"] = "user_id"
+	}
 	data["initial"] = displayInitial(data["display_name"])
 	return data
 }