Issue one installation credential for this private project.

Private and no-store. No catalog quota, paid read, public cache or CORS grant. Requires authentication within five minutes and exact empty JSON. The secret is returned once; store its download privately with mode 0600. At most three active installations per project. If the account exceeds its current project capacity, renew the pass or delete excess projects before issuance. A new token expires within 30 days or at the active pass end, whichever comes first. It cannot approve, buy, create a project or issue another credential. Returns: { esquema, projeto, instalacao, token, expira_em }