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/access.store.ts

@@ -0,0 +1,54 @@
+import { Injectable, computed, inject } from '@angular/core';
+import { toObservable } from '@angular/core/rxjs-interop';
+import { filter, firstValueFrom } from 'rxjs';
+import { RemoteData, fromResource } from '@shared/application/remote-data';
+import { Capability } from '@shared/domain/capability';
+import { MeAdapter, parseMe } from '@shared/infrastructure/me.adapter';
+
+type Err = Error | undefined;
+
+/**
+ * The current principal's capabilities (PRD-0002 §6) — one root singleton, like
+ * `SessionStore`/`BigProfileStore`. Global capabilities load once from `GET /me`;
+ * a screen's own decision DTO (e.g. `BriefViewDto.decisions`) covers anything tied
+ * to a specific resource's live status — no extra round-trip needed for that.
+ *
+ * `can()` is deny-by-default: loading, failed, or an unrecognized capability all
+ * resolve to `false`. This store never derives a capability from a role — it only
+ * mirrors what the server already resolved.
+ */
+@Injectable({ providedIn: 'root' })
+export class AccessStore {
+  private adapter = inject(MeAdapter);
+  private meRes = this.adapter.meResource();
+
+  private capabilities = computed<RemoteData<Err, Capability[]>>(() => {
+    const rd = fromResource(this.meRes);
+    if (rd.tag !== 'Success') return rd;
+    const parsed = parseMe(rd.value);
+    return parsed.ok
+      ? { tag: 'Success', value: parsed.value }
+      : { tag: 'Failure', error: new Error(parsed.error) };
+  });
+
+  can(capability: Capability): boolean {
+    const rd = this.capabilities();
+    return rd.tag === 'Success' && rd.value.includes(capability);
+  }
+
+  /** True once `/me` has resolved (success or failure) — lets a page-level gate tell
+      "still loading" apart from "denied", so an admin doesn't flash the denial alert. */
+  readonly ready = computed(() => {
+    const tag = this.capabilities().tag;
+    return tag === 'Success' || tag === 'Failure';
+  });
+
+  private ready$ = toObservable(this.ready);
+  /** Resolves once `/me` has settled (success or failure). The `capabilityGuard` awaits
+      this before deciding — otherwise it reads `can()` while `/me` is still loading and
+      wrongly denies (deny-by-default), bouncing even an entitled user. */
+  async whenReady(): Promise<void> {
+    if (this.ready()) return;
+    await firstValueFrom(this.ready$.pipe(filter((r) => r)));
+  }
+}