C1-C3 重构批:工件名表单源 + 月度准入收口 + ctx 形状收口(#201-#204) - #205

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. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/