feature:add alias config hint for Vite installation

[Junbiao06]

What

Add a helpful message when no import alias in tsconfig.json for Vite projects, by add alias config hint for Vite installation.

Why

Many users encounter issues when initializing shadcn-ui with Vite due to missing path alias configuration. The current error message lead us to https://ui.shadcn.com/docs/installation/vite, where does not provide actionable guidance.

This change improves developer experience by providing clear instructions on how to configure the required alias.

Changes

• Add clear instructions for configuring: tsconfig.json paths

Checklist

• Code follows project structure
• No breaking changes
• Tested locally using pnpm shadcn

[vercel]

@Junbiao06 is attempting to deploy a commit to the shadcn-pro Team on Vercel.

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