Denies a pending link request.
Requirements:
x-discord-actor must match the owner_discord_id on the request.x-discord-guild context.State behavior:
expired.denied, returns 200 with { already: true }.approved, returns 409.Partner API key provided by Northca.
Discord Guild ID (server/guild context for the request).
Discord User ID for the acting user (optional; used for audit fields).
Link request ID.