fix(docs): architecture.md 里三处指错的行号 —— main 上的 symbol-pin 门本来就是红的 - #1001

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/