Support non-interactive installation for CI/devcontainers (e.g., GitHub Codespaces)

[fengmk2]

Summary

The install script (curl -fsSL https://vite.plus | bash) prompts for user input when run as a postCreateCommand in GitHub Codespaces devcontainers, causing the setup to hang indefinitely.

Reproduction

Create a .devcontainer/devcontainer.json:

{
  "name": "Vite+",
  "image": "mcr.microsoft.com/devcontainers/typescript-node:4-24-trixie",
  "postCreateCommand": "curl -fsSL https://vite.plus | bash"
}

Open in GitHub Codespaces. The container creation loops forever because the installer prompts "Would you want Vite+ to manage Node.js versions?" but there's no way to provide input.

Root Cause

In install.sh:473, the interactive check [ -e /dev/tty ] && [ -t 1 ] passes in Codespaces because /dev/tty exists and stdout is attached to a pseudo-terminal during postCreateCommand.

Suggested Fix

Add an environment variable (e.g., VITE_PLUS_NODE_MANAGER=yes|no) to skip the interactive prompt, allowing fully non-interactive installs:

curl -fsSL https://vite.plus | VITE_PLUS_NODE_MANAGER=yes bash

[fengmk2]

should works now