chore(v0.1.9): 商用加固 5 项 — audit/deny-panic CI + release-on-tag + 生产 unwrap 清零 - #15

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/