test(portal-openbaar): drive the openbaar register page — list, search, empty state (refs #10)

Scaffolds the anonymous openbaar Angular app (mirrors self-service: standalone +
signals, NL DS via the ui lib, no auth) and adds a failing register-page spec:
loads the public register from the BFF on open, searches by term, and shows an
empty-state message. The stub page renders only the heading, so the list/search/
empty-state assertions fail (red).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/openbaar/src/app/app.config.ts

@@ -0,0 +1,19 @@
+import { provideHttpClient } from '@angular/common/http';
+import {
+  ApplicationConfig,
+  provideBrowserGlobalErrorListeners,
+} from '@angular/core';
+import { provideRouter } from '@angular/router';
+import { appRoutes } from './app.routes';
+
+/**
+ * The openbaar register is a public, anonymous read: no DigiD, no auth interceptor. The app is served
+ * same-origin as the BFF (nginx proxies /openbaar), so the api-client's relative calls stay same-origin.
+ */
+export const appConfig: ApplicationConfig = {
+  providers: [
+    provideBrowserGlobalErrorListeners(),
+    provideRouter(appRoutes),
+    provideHttpClient(),
+  ],
+};