CrossServerDirectMessageRelay
class CrossServerDirectMessageRelay(server: ProxyServer, logger: Logger, debug: DebugLogger = DebugLogger.Disabled)(source)
Routes cross-server direct messages to a single target server.
Unlike CrossServerChatRelay which broadcasts, this resolves the requested target server and player, then forwards the message only to that server. On failure it sends a PluginMessage.DirectMessageError back to the source.