Do not change system configuration without asking the user

[tsukinoko-kun]

Describe the bug

When I installed Vite+ on my Mac, I was first annoyed that it ignored all conventions it could have used and instead created ~/.vite-plus. I expected it to either use ~/Library/Application Support/vite-plus, $XDG_DATA_HOME/vite-plus or something similar.
I aborted the installation immediately. I set VP_HOME, deleted ~/.vite-plus and got greeted by a shell error:

source: Error encountered while sourcing file '/Users/frank/.vite-plus/env.fish':
source: No such file or directory

Please do not change my system configuration without asking me.

Not even working:

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

Setting up VITE+...

Would you like Vite+ to manage your Node.js versions?
It adds `node`, `npm`, `npx`, and `corepack` shims to ~/.vite-plus/bin/ and automatically uses the right version.
Opt out anytime with `vp env off`.
Press Enter to accept (Y/n): ^C⏎

> echo $VP_HOME
/Users/frank/Library/vite-plus

Steps to reproduce

Run curl -fsSL https://vite.plus | bash on Mac.

System Info

fish: Unknown command: vp

Used Package Manager

pnpm

Logs

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.