[docs] Update managed apps reference for v1.6.4

[cozystack-ci]

Automated docs update for release v1.6.4, generated at PROMOTE time from the release-1.6.4 staging branch (fetched via FETCH_REF; the stable tag v1.6.4 does not exist yet).

⛔ DO NOT MERGE until v1.6.4 is published. This PR is opened before the release exists. Merging it before pull-requests-release.yaml finalize publishes v1.6.4 flips the site's latest-version pointer to a version whose versioned docs and openapi.json are not on GitHub yet — every version-pin and API link for the new version 404s until the release lands. Park this PR until the GitHub release for v1.6.4 is live, then merge.

Opened early on purpose so the docs can be reviewed alongside the promote PR. tags.yaml::update-website-docs re-runs at tag time as a backstop and no-ops ("No changes to commit") when this already did the work.

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