feat: 把 PyPtt.TwoFactorAuthRequired 標成 TWO_FACTOR_AUTH_REQUIRED，別被 LoginError 吃掉 - #24

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-python@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/