Kervan v0.3.0

Added

• FTP: virtual hosts through RFC 7151 HOST (or the TLS server name
  for FTPS). Each host has its own banner and an optional group
  restriction, so several tenants can share one address.

• audit: syslog output (RFC 5424) over UDP, TCP, TLS or Unix sockets.
  It supports format: cef for SIEMs, configurable facility, RFC 6587
  framing with automatic reconnects, and escaping that prevents log
  injection.

Fixed

• FTP: FEAT reply lines start with a space as RFC 2389 requires. They
  were previously stripped, which some clients reject.

Changed

• WebUI live updates are event-driven. Sessions, transfers and audit
  events now push a WebSocket snapshot within about 200 ms of a change.
  Bursts collapse into one frame, and an idle connection gets a 15 s
  heartbeat instead of a frame every 2 s. The message format is unchanged.

Container image: docker pull ghcr.io/kervanserver/kervan:0.3.0 (linux/amd64, linux/arm64).

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