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/beheer/src/application/stamdata.store.spec.ts

@@ -0,0 +1,65 @@
+import { TestBed } from '@angular/core/testing';
+import { describe, it, expect } from 'vitest';
+import { Result, ok } from '@shared/kernel/fp';
+import { StamRow, StamTable } from '@beheer/domain/stamdata';
+import { StamdataAdapter } from '@beheer/infrastructure/stamdata.adapter';
+import { StamdataStore } from './stamdata.store';
+
+const table: StamTable = {
+  id: 'professions',
+  label: 'Opleiding → beroep',
+  temporal: false,
+  columns: [
+    { name: 'program', type: 'text', isKey: true, options: [] },
+    { name: 'beroep', type: 'text', isKey: false, options: [] },
+  ],
+};
+const rows: StamRow[] = [{ program: 'geneeskunde', beroep: 'Arts' }];
+
+function setup(): StamdataStore {
+  const adapter: Partial<StamdataAdapter> = {
+    list: (): Promise<Result<string, StamTable[]>> => Promise.resolve(ok([table])),
+    load: (): Promise<Result<string, { table: StamTable; rows: StamRow[] }>> =>
+      Promise.resolve(ok({ table, rows: rows.map((r) => ({ ...r })) })),
+  };
+  TestBed.configureTestingModule({ providers: [{ provide: StamdataAdapter, useValue: adapter }] });
+  return TestBed.inject(StamdataStore);
+}
+
+describe('StamdataStore undo/redo (WP-32)', () => {
+  it('records a cell edit, undoes and redoes it', async () => {
+    const store = setup();
+    await store.load();
+    expect(store.canUndo()).toBe(false);
+
+    store.editCell(0, 'beroep', 'Chirurg');
+    expect(store.rows()[0]['beroep']).toBe('Chirurg');
+    expect(store.canUndo()).toBe(true);
+
+    store.undo();
+    expect(store.rows()[0]['beroep']).toBe('Arts');
+    expect(store.canRedo()).toBe(true);
+
+    store.redo();
+    expect(store.rows()[0]['beroep']).toBe('Chirurg');
+    expect(store.canRedo()).toBe(false);
+  });
+
+  it('records addRow and undoes it', async () => {
+    const store = setup();
+    await store.load();
+    store.addRow();
+    expect(store.rows().length).toBe(2);
+    store.undo();
+    expect(store.rows().length).toBe(1);
+  });
+
+  it('clears history when switching table', async () => {
+    const store = setup();
+    await store.load();
+    store.addRow();
+    expect(store.canUndo()).toBe(true);
+    await store.selectTable('professions');
+    expect(store.canUndo()).toBe(false);
+  });
+});