fix: get vite_plus_home from node wrapper's path

[liangmiQwQ]

Close #1184

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[liangmiQwQ]

Done!

This PR used which crate to find vp's executable file and it's grandparent directory is expected to be vite_plus_home.

The reason not to use std::env::current_exe() is that node is essentially a symlink, and this function would get vp binary file's path. It makes both tests and debugs harder and less stable than a certain path in $PATH var. ($HOME reading logic is also kept if the node is not controlled by vp)

As which crate is also used in vite_command crate, so there is no cost for new dependencies.

Thanks!

[liangmiQwQ]

@codex

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

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[fengmk2]

@liangmiQwQ Thanks!