### What?
Make the document `id` available to server-rendered admin components
that expect it—specifically `EditMenuItems` and
`BeforeDocumentControls`—so `props.id` matches the official docs.
### Why?
The docs show examples using `props.id`, but the runtime `serverProps`
and TS types didn’t include it. This led to `undefined` at render time.
### How?
- Add id to ServerProps and set it in renderDocumentSlots from
req.routeParams.id.
Fixes#13420
96074530b1