Add registratie wizard, BFF dashboard-view, contracts/value-objects, and architecture docs

Checkpoint of in-progress work: the registration wizard (address prefill,
DUO diploma lookup, policy questions), decision-DTO contracts, parse-don't-
validate value objects, infrastructure adapters, plus CLAUDE.md and the
architecture/ADR docs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/shared/layout/breadcrumb/breadcrumb.stories.ts

@@ -0,0 +1,23 @@
+import type { Meta, StoryObj } from '@storybook/angular';
+import { applicationConfig } from '@storybook/angular';
+import { provideRouter } from '@angular/router';
+import { BreadcrumbComponent } from './breadcrumb.component';
+
+const meta: Meta<BreadcrumbComponent> = {
+  title: 'Layout/Breadcrumb',
+  component: BreadcrumbComponent,
+  decorators: [applicationConfig({ providers: [provideRouter([])] })],
+  render: (args) => ({
+    props: args,
+    template: `<app-breadcrumb [items]="items" />`,
+  }),
+};
+export default meta;
+type Story = StoryObj<BreadcrumbComponent>;
+
+export const TweeNiveaus: Story = {
+  args: { items: [{ label: 'Mijn omgeving', link: '/dashboard' }, { label: 'Inschrijven in het BIG-register' }] },
+};
+export const DrieNiveaus: Story = {
+  args: { items: [{ label: 'Mijn omgeving', link: '/dashboard' }, { label: 'Registratie', link: '/registratie' }, { label: 'Inschrijven' }] },
+};