ci: publish docs artifact for the portal mirror

[pratyush618]

docs.byteveda.org/<slug>/ 404s today. GitHub Pages binds a custom domain to exactly
one repository, so this repo cannot serve a subpath of a domain held by
ByteVeda/byteveda.site — setting the domain here just reports already taken by
another repository.

Instead the docs portal mirrors each tool's build into its own export
(ByteVeda/byteveda.site#220).
This repo's own byteveda.github.io/<slug>/ site is unaffected — the docs are copied,
not moved.

The portal cannot use the existing github-pages artifact: upload-pages-artifact
hardcodes a 1-day retention, so it has always expired by the time the portal next
builds (all five tool repos currently report expired: true). This adds one step
publishing the same directory as docs-dist with a 90-day retention.

No change to how this repo builds or deploys its docs.

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• .github/workflows/docs.yml

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