Local end-to-end runs trip the API's login throttle #1835

A local pnpm test:e2e run had 49 of 327 tests fail, every one on a login:

• The api-client.ts fixtures got 429 ThrottlerException: Too Many Requests from
  POST /v1/auth/login.
• Logins through the UI were bounced back to /auth/login.

The failures began partway through the run and hit every later spec that logs in, including static
pages such as About and Contact. Re-running the same 49 tests with --workers=2, they passed. CI is
unaffected because it runs one worker.

Cause

• testing/playwright.config.ts sets workers: process.env.CI ? 1 : undefined with
  fullyParallel: true, so a local run uses half the machine's cores.
• Each worker logs in for its own fixtures (adminToken, roleAccount), and some specs log in
  through the UI.
• The API that Playwright starts (apps/api's dev:test) reads the normal .env, which has
  THROTTLER_ENABLED=true. LOGIN_REQUEST_THROTTLER_LIMIT falls back to 50 logins per 60 seconds
  per IP, and every worker shares one IP.

Possible fixes

• Raise or disable the login throttle for the dev:test API only. This keeps local runs parallel and
  changes nothing in production.
• Or cap the number of local workers.