Clear and concise description of the problem

(First of all, thank you for awesome library!)

I use vite-ssg to generate pages for GitHub actions.
But vite-ssg doesn't recognize [...path].vue, nor 404.html.
There is a workaround, but it looks ugly:

    routes: [
      ...routes,
      // [...path] を404として認識させるハック
      {
        ...routes.find((route) => route.name === "/[...path]")!,
        path: "/404",
        name: "/404",
      },
    ],

Suggested solution

Support [...notFound].vue as 404 page.

Alternative

N/A?

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.