Use NodeSource LTS repositories for reliable Node.js 20+ bootstrap on Linux

[Copilot]

Installing Node.js via default apt-get/dnf/yum packages often yields outdated versions that fail the >= 20 version gate, breaking fresh-machine installs. The existing skip-if-present logic was already correct; only the installation path needed fixing.

Changes

• install.sh — ensure_node_runtime: For apt-get and dnf/yum, run the official NodeSource LTS setup script before installing nodejs, replacing the bare distro-package install:

  apt-get)
    log "Adding NodeSource LTS repository..."
    if ! curl -fsSL https://deb.nodesource.com/setup_lts.x | sudo -E bash -; then
      echo "Failed to set up NodeSource repository for Node.js." >&2
      exit 1
    fi
    install_with_manager "${manager}" nodejs
    ;;

  Using setup_lts.x ensures the latest LTS release is always installed rather than pinning to a specific major version. The minimum required version remains Node.js 20. Both Linux branches include explicit error handling on the setup script so failures surface with a clear message rather than a confusing downstream install error. Installation is skipped entirely when node and npm are already present at a compatible version (>= 20).

• tests/install-script.test.js: Two new tests — one asserting the skip-if-node >= 20-present guard, one asserting the NodeSource LTS URLs (setup_lts.x) and | sudo -E bash - pattern are present for both Debian and RPM targets.

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[ChangeHow]

不是，哥们，别用 node18，至少要求 node20 @copilot

[Copilot]

不是，哥们，别用 node18，至少要求 node20 @copilot

已改为 Node.js 20：NodeSource URL 改为 setup_20.x，版本门槛改为 -ge 20，所有错误提示也同步更新。commit: 00d3da3

[ChangeHow]

最好提供 lts 的下载，然后这里有检查本地是否安装 node 吗？ @copilot

[Copilot]

已改用 setup_lts.x（deb 和 rpm 都改了），commit: a06c39a。

本地已有检查：ensure_node_runtime 开头先检测 node 和 npm 是否存在且版本 >= 20，满足则直接 return 0 跳过安装，不会重复安装。