4b736263e0
Production moq-relay (moq.nostrnests.com) and the kixelated browser client both ship Lite-04 now. We previously only advertised moq-lite-03 in the wt-available-protocols header, so a Lite-04-only relay deployment would refuse the WebTransport CONNECT (no mutual sub-protocol). Add moq-lite-04 to the advertised list. The on-the-wire framing for Subscribe / Group / Announce did NOT change between Lite-03 and Lite-04, so the existing codec handles either selection unchanged — this is purely a handshake-layer addition. moq-lite-03 stays listed first so a relay that supports both still picks the previously-tested path. Constants now live on MoqLiteAlpn alongside LITE_03 and LEGACY rather than being a string literal in QuicWebTransportFactory. https://claude.ai/code/session_014JfZJHSTvyYYWJbC9VbB47