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>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help services services-stop api app portal docs migrate fresh db-shell test test-db-create schema-dump
+.PHONY: help services services-stop api app docs migrate fresh db-shell test test-db-create schema-dump
 
 # Colors
 GREEN  := \033[0;32m
@@ -19,7 +19,6 @@ help:
 	@echo "  $(YELLOW)Development Servers:$(NC)"
 	@echo "    make api              Laravel API        → http://localhost:8000"
 	@echo "    make app              Organizer SPA      → http://localhost:5174"
-	@echo "    make portal           Portal SPA         → http://localhost:5175"
 	@echo "    make docs             VitePress docs     → http://localhost:5176"
 	@echo ""
 	@echo "  $(YELLOW)Database:$(NC)"
@@ -58,10 +57,6 @@ app:
 	@echo "$(GREEN)Starting Organizer SPA → http://localhost:5174$(NC)"
 	@cd apps/app && pnpm dev
 
-portal:
-	@echo "$(GREEN)Starting Portal SPA → http://localhost:5175$(NC)"
-	@cd apps/portal && pnpm dev
-
 docs:
 	@echo "$(GREEN)Starting VitePress docs → http://localhost:5176$(NC)"
 	@cd docs && npm run docs:dev