Protected pre-rendered routes

Describe the problem

I have an expensive static page which also happens to be a protected route.

I would love to prerender the page, but then it is not handled by SvelteKit.

Requests for static assets — which includes pages that were already prerendered — are not handled by SvelteKit.

https://kit.svelte.dev/docs/hooks#server-hooks-handle

Describe the proposed solution

1. Add another page option in +page|layout.server.ts such as server: true.
2. Add another value for the current prerender option such as protected.
3. (Breaking) Convert the page prerender option into an object?

type Prerender = { enabled: boolean; protected: boolean };

https://kit.svelte.dev/docs/page-options#prerender

I am sure there are other usage then protected, but it seemed the most intuitive.

Alternatives considered

No response

Importance

would make my life easier

Additional Information

No response

Start by reading the page options for +page|layout.server.ts and the prerender documentation linked in the issue, then trace how pre-rendered pages are excluded from server hooks. Define and implement a supported way for a pre-rendered protected route to retain server handling, including any option or breaking-change implications, and verify the behavior with the relevant project tests.