feat(WP-67): merge behandelportal into this repo as a monorepo

Restructures into apps/ssp + apps/behandelportal (two Angular projects)
plus libs/shared + libs/beheer (cross-app libraries), replacing WP-61's
separate sibling repo. That split had already produced real drift: a
hand-vendored copy of the backend's OpenAPI doc, a shared/ui+layout tree
forked and silently diverging (7 files), and beheer + the styles.scss
token bridge duplicated byte-for-byte across both repos.

- git mv the SSP's src/app/* into apps/ssp/; fold shared/, beheer/,
  environments/, the Storybook docs/*.mdx, and styles.scss into
  libs/shared + libs/beheer (all confirmed identical between the two
  repos before merging). auth stays deliberately duplicated per
  ADR-0002 (actor-specific, expected to diverge) - amended there.
- One generated API client (libs/shared), no more vendored swagger.json.
- .dependency-cruiser split into a base factory + one config per app,
  and Storybook into .storybook-ssp/.storybook-behandelportal - both
  forced by the @auth/* alias resolving to different directories per app.
- SiteHeaderComponent/ShellComponent gained HEADER_NAV_ITEMS/
  HEADER_ADMIN_LINKS/DEBUG_PANEL injection tokens so each app supplies
  its own nav/admin-links/dev-panel instead of one being hardcoded.
- CLAUDE.md, ARCHITECTURE.md, dependencies.md, and ADR-0002 updated;
  WP-67 backlog entry documents the full decision trail.

npm run ci green (lint, dep:check x2, 360 tests across ssp/
behandelportal/shared/beheer, both localized builds, backend tests,
snippet + api-client drift); both dev servers, both Storybook
instances, and docker compose verified working.

The old sibling repo (/home/eho/repos/behandelportal) is left
untouched, not deleted.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

libs/shared/src/ui/choice-list/choice-list.component.ts

@@ -0,0 +1,22 @@
+import { Component, input } from '@angular/core';
+
+let nextId = 0;
+
+/** Molecule: the CIBG Huisstijl "keuzelijst" — a heading semantically linked
+    (`aria-labelledby`) to a list of `<app-choice-link>` choices, used where a
+    screen offers a set of options to pick between (see
+    designsystem.cibg.nl/componenten/keuzelijst). Domain-free — the caller
+    supplies the heading text and the choices. */
+@Component({
+  selector: 'app-choice-list',
+  template: `
+    <h2 class="header header--medium" [id]="headingId">{{ heading() }}</h2>
+    <ul class="keuzelijst__list" [attr.aria-labelledby]="headingId">
+      <ng-content />
+    </ul>
+  `,
+})
+export class ChoiceListComponent {
+  heading = input.required<string>();
+  protected readonly headingId = `choice-list-${nextId++}`;
+}

libs/shared/src/ui/choice-list/choice-list.stories.ts

@@ -0,0 +1,31 @@
+import type { Meta, StoryObj } from '@storybook/angular';
+import { applicationConfig, moduleMetadata } from '@storybook/angular';
+import { provideRouter } from '@angular/router';
+import { ChoiceListComponent } from './choice-list.component';
+import { ChoiceLinkComponent } from '@shared/ui/choice-link/choice-link.component';
+
+const meta: Meta<ChoiceListComponent> = {
+  title: 'Design System/Molecules/Choice List',
+  component: ChoiceListComponent,
+  decorators: [
+    applicationConfig({ providers: [provideRouter([])] }),
+    moduleMetadata({ imports: [ChoiceLinkComponent] }),
+  ],
+  render: (args) => ({
+    props: args,
+    template: `
+      <app-choice-list [heading]="heading">
+        <app-choice-link heading="Ik heb een Nederlands diploma" instructions="U kunt direct uw registratie aanvragen." to="/registreren" />
+        <app-choice-link heading="Ik heb een buitenlands diploma" instructions="Uw diploma moet eerst officieel erkend worden." clickable="true" />
+      </app-choice-list>`,
+  }),
+  parameters: {
+    // Structural: app-choice-link's host sits between the <ul> and its <li> —
+    // fixed by the WP-11 markup rework. See docs/project/backlog/WP-11-markup-fidelity.md.
+    a11y: { disable: true },
+  },
+};
+export default meta;
+type Story = StoryObj<ChoiceListComponent>;
+
+export const Default: Story = { args: { heading: 'Maak een keuze' } };