d1bc98d0f8
Implements the signevent capability from nostr-protocol/nips#2389: relay admins can ask the relay to sign an unsigned event template with its own (self) key. - nip86: SignEvent MethodParams type + "signevent" decode case (round-trips the {kind, content, tags, created_at} param into a nostr.Event). - khatru: RelayManagementAPI.SignEvent hook + dispatch returning the signed event as the result.