change index.ts string literal in library template from "Hello, tsdown!" to "Hello, vite+!" #3062

Description

currently, library template of vp create will add src/index.ts and then write "Hello, tsdown!" into there. but this is vite+ template, therefore it should be "Hello, vite+!".

Suggested solution

replace "tsdown" with "vite+". this will be hardcode or like something. i think hardcode is easy way to do this, but if there are better solution, it would be good.

Alternative

No response

Additional context

vite+ is too big in my pc. so i'll not send PR.

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.