`install.sh` doesn't respect shell config directory settings (ZDOTDIR, XDG_CONFIG_HOME)

[mst-mkt]

Describe the bug

install.sh ignores shell config directory settings when writing PATH configuration. It hardcodes default paths instead of respecting the environment variables that each shell uses to customize config locations.

Affected shells and the expected config paths:

• zsh (ZDOTDIR)
  • $HOME/.zshenv -> $ZDOTDIR/.zshenv
  • $HOME/.zshrc -> $ZDOTDIR/.zshrc
• fish (XDG_CONFIG_HOME)
  • $HOME/.config/fish/conf.d/vite-plus.fish -> $XDG_CONFIG_HOME/fish/conf.d/vite-plus.fish

Users with custom config directories will have PATH configuration written to the wrong location, and vp may not be available in new shells.

Reproduction

N/A

Steps to reproduce

1. Have ZDOTDIR persistently set to a custom directory (e.g. via /etc/zsh/zshenv)
2. Run curl -fsSL https://vite.plus | bash
3. PATH configuration is written to $HOME/.zshenv and $HOME/.zshrc instead of $ZDOTDIR/.zshenv and $ZDOTDIR/.zshrc
4. Opening a new shell does not have vp in PATH (zsh: command not found: vp)

System Info

(This is a bug in `install.sh`, so the system info below is from a working installation where I manually patched the script.)

- `vp env current`


VITE+ - The Unified Toolchain for the Web

Environment:
  Version  24.14.0
  Source   lts

Tool Paths:
  node  /home/mst-mkt/.vite-plus/js_runtime/node/24.14.0/bin/node
  npm   /home/mst-mkt/.vite-plus/js_runtime/node/24.14.0/bin/npm
  npx   /home/mst-mkt/.vite-plus/js_runtime/node/24.14.0/bin/npx


- `vp --version`


VITE+ - The Unified Toolchain for the Web

vp v0.1.11

Local vite-plus:
  vite-plus  Not found

Tools:
  vite             Not found
  rolldown         Not found
  vitest           Not found
  oxfmt            Not found
  oxlint           Not found
  oxlint-tsgolint  Not found
  tsdown           Not found

Used Package Manager

pnpm

Logs

$ ls ~/.zshenv ~/.zshrc
"/home/mst-mkt/.zshenv": No such file or directory (os error 2)
"/home/mst-mkt/.zshrc": No such file or directory (os error 2)

$ echo $ZDOTDIR
/home/mst-mkt/.config/zsh

$ curl -fsSL https://vite.plus | bash

Setting up VITE+...

Would you want Vite+ to manage Node.js versions?
Press Enter to accept (Y/n):

✔ VITE+ successfully installed!

  The Unified Toolchain for the Web.

  Get started:
    vp create       Create a new project
    vp env          Manage Node.js versions
    vp install      Install dependencies
    vp migrate      Migrate to Vite+

  Vite+ is now managing Node.js via vp env.
  Run vp env doctor to verify your setup, or vp env off to opt out.

  Run vp help to see available commands.

  Note: Run `source ~/.zshenv` or restart your terminal.


$ ls ~/.zshenv ~/.zshrc
"/home/mst-mkt/.zshrc": No such file or directory (os error 2)
󱆃 /home/mst-mkt/.zshenv

$ cat ~/.zshenv

# Vite+ bin (https://viteplus.dev)
. "$HOME/.vite-plus/env"

$ vp
zsh: command not found: vp

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue for the same bug.
• Confirm this is a Vite+ issue and not an upstream issue (Vite, Vitest, tsdown, Rolldown, or Oxc).
• The provided reproduction is a minimal reproducible example.