feat: disabled guest login - macOS

modules/darwin/apps.nix

@@ -56,6 +56,11 @@
         NSNavPanelExpandedStateForSaveMode = true;  # expand save panel by default(保存文件时的路径选择/文件名输入页)
         NSNavPanelExpandedStateForSaveMode2 = true;
       };
+
+      loginwindow = {
+        GuestEnabled = false;  # disable guest user
+        SHOWFULLNAME = true;  # show full name in login window
+      };
     };
 
     # keyboard settings is not very useful on macOS