chore(docs): drop apps/portal references from load-bearing files

Three load-bearing files still described the pre-WS-3 dual-SPA
reality. Surgical edits to reflect the single-SPA architecture
shipped in WS-3 PR-B (B1: portal moves; B2a: auth+routing
consolidation; B2b: server-side cookie consolidation).

CLAUDE.md:
- Quality-gates ts-reset bullet (line 27): "both SPAs" → "the SPA"
- Quality-gates Vitest bullet (lines 30-32): rewrite from "apps/portal
  has 113+ tests; apps/app currently has no Vitest setup (TECH-APP-VITEST)"
  to current truth: apps/app has Vitest with 213 tests as of PR-B2a.
  TECH-APP-VITEST is implicitly closed.
- Repository layout (line 44): drop apps/portal/ bullet; rephrase
  apps/app/ as the single workspace
- "Apps and portal architecture" → "App architecture": rewrite for
  single-workspace + two access modes. Login-based covers
  organizers + volunteers + crew + super_admin (context-routed
  in-app via useAuthStore.availableContexts); token-based covers
  artists, suppliers, press
- CORS subsection: collapse two-origin config to single origin
  (localhost:5174 dev, https://crewli.app prod). Preserve the
  existing crewli.nl marketing-only note

WS-TOOLING-001 sections (Larastan, Rector, Telescope tooling
configuration) verified untouched via `git diff CLAUDE.md`.

README.md (line 25): collapse the Applications table from two rows
(Organizer + Portal) to one (SPA). Adjust trailing sentence accordingly.

Makefile:
- .PHONY list: drop `portal`
- help echo: drop "make portal" line
- portal target: removed (the underlying `cd apps/portal && pnpm dev`
  would fail since the directory was removed in PR-B1)

Out of scope (deferred to TECH-DOCS-APPS-PORTAL-PURGE backlog item):
.cursor/ instructions, MASTER_PROMPT_*, dev-docs/SETUP, dev-docs/dev-guide,
dev-docs/CLAUDE_CODE_TOOLING. WS-3-SESSION-1C-AUDIT.md skipped (frozen
historical doc).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -21,10 +21,9 @@ Implementation is phased; the authoritative feature and schema list lives in the
 
 | App | Path | Port | Role |
 |-----|------|------|------|
-| **Organizer** | `apps/app/` | 5174 | Main product for **org and event staff**: events, sections, shifts, people, artists, accreditation, briefings, reports. Includes **Platform Admin** section for super admins (`/platform/*`). |
-| **Portal** | `apps/portal/` | 5175 | **External** users: stripped layout; login- or token-based access. |
+| **SPA** | `apps/app/` | 5174 | Single-SPA product covering **organizers, volunteers, crew, super admins** (context-routed in-app), plus token-based access for artists, suppliers, press. Includes **Platform Admin** section for super admins (`/platform/*`). |
 
-All apps talk to the API over **CORS** with **Laravel Sanctum** tokens.
+The SPA talks to the API over **CORS** with **Laravel Sanctum** tokens.
 
 ---