`ApiLink` generates incorrect URL for versioned docs

[Mantisus]

ApiLink always resolves to /api/class/<ClassName> regardless of the active Docusaurus
version. For the next version, it should resolve to /api/next/class/<ClassName>.

This causes the docs CI check to fail when a PR introduces new public classes, since they
don't exist in the stable API docs yet.

Example - https://github.com/apify/crawlee-python/actions/runs/25296078686/job/74155036886