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>

apps/ssp/src/app/registratie/infrastructure/change-request.adapter.ts

@@ -0,0 +1,20 @@
+import { Injectable, inject } from '@angular/core';
+import { ApiClient } from '@shared/infrastructure/api-client';
+import { Valid } from '@registratie/domain/change-request.machine';
+
+/**
+ * Infrastructure adapter for the telefoonwijziging POST (`/api/v1/change-requests`) —
+ * the single place the network client lives for contact changes, so the command
+ * and the UI never touch `ApiClient`. The BRP address is authoritative and not
+ * submitted (WP-34); only the phone number is. Returns the server reference; the
+ * server re-validates and is the authority.
+ */
+@Injectable({ providedIn: 'root' })
+export class ChangeRequestAdapter {
+  private client = inject(ApiClient);
+
+  async changeRequest(data: Valid): Promise<string> {
+    const res = await this.client.changeRequests({ telefoon: data.telefoon });
+    return res.referentie ?? '';
+  }
+}