feat(linux): AppImage 嵌入更新信息并发布 .zsync 增量更新（AppImageUpdate/AppImageLauncher 支持） - #83

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-dotnet@v4, actions/setup-java@v4, actions/setup-node@v4, actions/upload-artifact@v4, android-actions/setup-android@v3, pnpm/action-setup@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/