vp create with non-global package manager

[cavivie]

Description

vp create works perfectly when I have a global package manager. Conversely, if I try to create a project using vp create and then install a package manager for per-project mode using methods like mise, it fails.

The experience would be much better if I could start working without a pre-installed package manager, as I've always installed package managers per-project mode without a global package manager (except for npm).

Suggested solution

1. During vp create when selecting a package manager:

• It may check if the user has a global package manager, and provides their selections.
• If no other global package manager exists, it will fall back to the npm package manager.

2. When vp acts as a package manager:

• It provides a padding for vp, providing the functionality to download a package manager.
• vp itself is a package manager (requiring vp to implement functions similar to npm, pnpm, yarn, etc.).

Alternative

No response

Additional context

No response

Validations

• Read the Contributing Guidelines.
• Confirm this request is for Vite+ itself and not for Vite, Vitest, tsdown, Rolldown, or Oxc.
• Check that there isn't already an issue requesting the same feature.