POST /api/document/{document-id}/public-link

Generate a publicly-accessible UUID for a Document.

Creates a public link that allows viewing the Document without authentication. If the Document already has a public UUID, returns the existing one rather than generating a new one. This enables sharing the Document via GET /api/ee/public/document/:uuid.

Returns a map containing :uuid (the public UUID string).

Requires superuser permissions. Public sharing must be enabled via the enable-public-sharing setting.