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/application/remote-data.spec.ts

@@ -0,0 +1,22 @@
+import { describe, it, expect } from 'vitest';
+import { RemoteData, map2, map } from './remote-data';
+
+const loading: RemoteData<string, number> = { tag: 'Loading' };
+const failure: RemoteData<string, number> = { tag: 'Failure', error: 'x' };
+const ok = (n: number): RemoteData<string, number> => ({ tag: 'Success', value: n });
+
+describe('RemoteData combinators', () => {
+  it('map only touches Success', () => {
+    const times10 = (n: number) => n * 10;
+    expect(map(ok(2), times10)).toEqual({ tag: 'Success', value: 20 });
+    expect(map(loading, times10)).toEqual(loading);
+  });
+
+  it('map2 precedence: Failure > Loading > Success', () => {
+    const add = (a: number, b: number) => a + b;
+    expect(map2(failure, ok(1), add)).toEqual(failure); // a failed
+    expect(map2(ok(1), failure, add)).toEqual(failure); // b failed
+    expect(map2(loading, ok(1), add)).toEqual({ tag: 'Loading' });
+    expect(map2(ok(2), ok(3), add)).toEqual({ tag: 'Success', value: 5 });
+  });
+});