refactor(auth): consolidate to single cookie post single-SPA

The dual-cookie machinery (crewli_app_token + crewli_portal_token,
Origin-based resolution) was load-bearing only when the second SPA
existed. apps/portal/ was deleted in WS-3 PR-B1; the resolver code
has been carrying dead branches since then. Collapse to one cookie.

Cookie name retained as crewli_app_token — no session breakage on
deploy. crewli_portal_token is fully purged from the server-side.

CookieBearerToken middleware:
- COOKIE_NAMES array → single COOKIE_NAME constant
- resolveCookieName method (Origin/Referer parsing, host+port
  matching against frontend_app_url/frontend_portal_url) → removed
- Body collapses to: skip if Authorization header present; else
  read crewli_app_token cookie and inject Bearer header

SetAuthCookie trait:
- COOKIE_MAP / resolveCookieName / originMatches → removed
- makeAuthCookie / forgetAuthCookie now take only $token; the
  cookie name is the trait's private constant

Five callers updated to drop the resolveCookieName($request) line
and the cookie-name argument: LoginController (3 sites),
MfaVerifyController (1 site), AuthRefreshController (1 site),
LogoutController (1 site), InvitationController (1 site — caller
list in the prompt missed this one but the same pattern applies).

frontend_portal_url config key retained (per Phase A directive Q1):
EmailChangeController, PasswordResetController, PersonController are
non-auth consumers that build per-app URL maps for outbound emails.
The map structure is now functionally redundant (production resolves
all FRONTEND_* env vars to the same host) but stays structurally
intact. Refactor tracked as TECH-FRONTEND-URL-CONSOLIDATE in the
upcoming docs commit.

HttpOnlyCookieAuthTest:
- Removed 4 dual-cookie tests (login_sets_portal_cookie_for_portal_origin,
  app_cookie_does_not_authenticate_portal_requests,
  portal_cookie_does_not_authenticate_app_requests,
  correct_cookie_authenticates_with_matching_origin)
- Renamed login_sets_app_cookie_for_unknown_origin →
  login_sets_app_cookie_regardless_of_origin; expanded to four
  Origin variants (none, app, unknown, foreign) — pins the new
  origin-agnostic contract
- Removed Origin headers from request calls in remaining tests
  (now meaningless)

Backend test count: 1491 → 1487 (-4 deleted, dual-cookie tests
encoding the obsolete contract). Pint clean. Larastan clean.

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

api/app/Http/Controllers/Api/V1/Auth/MfaVerifyController.php

@@ -4,12 +4,12 @@ declare(strict_types=1);
 
 namespace App\Http\Controllers\Api\V1\Auth;
 
+use App\Enums\MfaMethod;
 use App\Http\Controllers\Api\V1\Traits\SetAuthCookie;
 use App\Http\Controllers\Controller;
 use App\Http\Requests\Api\V1\Auth\MfaEmailSendRequest;
 use App\Http\Requests\Api\V1\Auth\MfaVerifyRequest;
 use App\Http\Resources\Api\V1\MeResource;
-use App\Enums\MfaMethod;
 use App\Models\User;
 use App\Services\MfaService;
 use Illuminate\Http\JsonResponse;
@@ -58,19 +58,18 @@ final class MfaVerifyController extends Controller
         ]);
 
         $token = $user->createToken('auth-token')->plainTextToken;
-        $cookieName = $this->resolveCookieName($request);
 
         return $this->success([
             'user' => new MeResource($user),
         ], 'MFA verification successful')
-            ->withCookie($this->makeAuthCookie($cookieName, $token));
+            ->withCookie($this->makeAuthCookie($token));
     }
 
     public function sendEmailCode(MfaEmailSendRequest $request): JsonResponse
     {
         $sessionToken = $request->validated('mfa_session_token');
 
-        $cacheKey = 'mfa_session:' . $sessionToken;
+        $cacheKey = 'mfa_session:'.$sessionToken;
         $session = Cache::get($cacheKey);
 
         if (! $session) {