test(api-client): generated BFF client is exposed and calls the endpoints (refs #66)

Scaffold libs/api-client (Nx Angular lib) and generate a typed HttpClient client
from services/bff/openapi.json with orval (node-based; Angular target integrates
with HttpClient interceptors for the S-08c auth token). A failing test drives the
public API: it expects an injectable BffApiV1Service to POST /self-service/registrations
and GET /openbaar/register (via HttpClientTesting), but the lib barrel doesn't export
the client yet, so it fails. Normalise the vitest target to 'test'. Green exposes it.

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

libs/api-client/src/lib/bff-api.spec.ts

@@ -0,0 +1,50 @@
+import { provideHttpClient } from '@angular/common/http';
+import {
+  HttpTestingController,
+  provideHttpClientTesting,
+} from '@angular/common/http/testing';
+import { TestBed } from '@angular/core/testing';
+import {
+  BffApiV1Service,
+  type OpenbaarEntry,
+  type SubmitAccepted,
+} from 'api-client';
+
+describe('BffApiV1Service (generated from services/bff/openapi.json)', () => {
+  let service: BffApiV1Service;
+  let http: HttpTestingController;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [provideHttpClient(), provideHttpClientTesting()],
+    });
+    service = TestBed.inject(BffApiV1Service);
+    http = TestBed.inject(HttpTestingController);
+  });
+
+  afterEach(() => http.verify());
+
+  it('submits a registration via POST /self-service/registrations', () => {
+    let result: SubmitAccepted | undefined;
+    service.postSelfServiceRegistrations().subscribe((r) => (result = r));
+
+    const req = http.expectOne('/self-service/registrations');
+    expect(req.request.method).toBe('POST');
+    req.flush({ registrationId: 'reg-1', status: 'Ingediend' });
+
+    expect(result?.registrationId).toBe('reg-1');
+    expect(result?.status).toBe('Ingediend');
+  });
+
+  it('reads the openbaar register via GET /openbaar/register with the query', () => {
+    let rows: OpenbaarEntry[] | undefined;
+    service.getOpenbaarRegister({ q: 'abc' }).subscribe((r) => (rows = r));
+
+    const req = http.expectOne((r) => r.url === '/openbaar/register');
+    expect(req.request.method).toBe('GET');
+    expect(req.request.params.get('q')).toBe('abc');
+    req.flush([{ id: 'abc-111', status: 'INGEDIEND' }]);
+
+    expect(rows?.[0].id).toBe('abc-111');
+  });
+});