chore(portal-frontend): scaffold Angular workspace

Raw `ng new` output for the Session-2 Angular portal, reachable at
/portal alongside the existing new-frontend placeholder.

portal-frontend/src/app/app.config.ts

@@ -0,0 +1,11 @@
+import { ApplicationConfig, provideBrowserGlobalErrorListeners } from '@angular/core';
+import { provideRouter } from '@angular/router';
+
+import { routes } from './app.routes';
+
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideBrowserGlobalErrorListeners(),
+    provideRouter(routes)
+  ]
+};