Team access: List the documents in the shared base.

Team access uses current account membership, product access and resource sharing on every request. Revocation also blocks search, originals, Markdown, OKF and ZIP downloads with an existing session or key. Sharing a collection grants current and future files in its owner's referenced bases; other owners' bases expose published files only. Sharing does not publish a resource. Only the resource owner changes sharing. The initial grant requires the owner's session with origin and CSRF checks. Organization API keys stay within their existing grants. Responses use private, no-store. Returns: { base{id,name,visibility,dataset,created_at,updated_at,documents,bytes,api,export_url,okf_url,public_url,embed_url,publication}, items[{id,base_id,filename,title,format,managed,sha256,bytes,status,created_at,api,source_url?,source_sha256?,pages?,review?,markdown_url,original_url,okf_url}], next, read_only, answer?{id,question,status,statements,created_at?,charged?}, question_price_usd? }