feat(nuxt): ensure prefetchComponents be treeshake on server

[Mini-ghost]

🔗 Linked issue

N/A

📚 Description

Before

export const prefetchComponents = (components: string | string[]) => {
  return preloadComponents(components)
}

prefetchComponents and preloadComponents are both not tree shaken on the server side.

After

export const prefetchComponents = (components: string | string[]) => {
  if (import.meta.server) { return }
  return preloadComponents(components)
}

prefetchComponents and preloadComponents are both tree shaken on the server side.

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