Add DefaultApplication to conf

web/src/App.js

@@ -107,7 +107,7 @@ class App extends Component {
     Setting.initServerUrl();
     Auth.initAuthWithConfig({
       serverUrl: Setting.ServerUrl,
-      appName: "app-built-in", // the application name of Casdoor itself, do not change it
+      appName: Conf.DefaultApplication, // the application used in Casdoor root path: "/"
     });
   }