8afa998516
- Add rate limiter to TCP and HTTP servers - Share single LSMTree between TCP and HTTP servers - Replace unsafe cast[string]/cast[seq[byte]] with safe helpers - Stabilize gossip UDP socket with exponential backoff - Fix TCP_NODELAY via low-level setSockOptInt(IPPROTO_TCP) (asyncnet.setSockOpt(OptNoDelay) uses SOL_SOCKET and fails) - Apply TCP_NODELAY to server and websocket sockets