Request Magic Link Access

Submit a reader's email as a pending request to be added to the space's magic-link whitelist. The request does NOT grant access on its own — an admin must approve it. The space must be configured for Magic Link (Magic Link enabled, the portal gating content, and the team's plan allowing it); otherwise the request is refused with 400. There is one request per (email, space). A repeat request for the same email is idempotent per status: a Pending request returns the existing row unchanged; an Accepted request whose email is still whitelisted also returns it unchanged; but an Accepted request whose access was later revoked, or a previously Rejected request, is put back into the Pending queue and re-notifies the admins — so a rejected or revoked reader can always re-apply.