Neewer-Bridge v1.2.1

Fixed

• A single oversized UDP datagram could crash the whole bridge on Windows.
  recv_from into the old 1024-byte buffer fails with WSAEMSGSIZE there (Linux
  silently truncates instead), and a listener error is deliberately fatal — so
  any packet over 1024 bytes sent to the ArtNet port took the bridge down. The
  receive buffer now covers the maximum UDP payload, and Windows' spurious
  connection-reset notifications on UDP sockets are ignored instead of fatal.
• power_on_connect = false powered the light OFF at connect. It now means
  what it says: the bridge sends nothing at all to that light — no power, no
  colour — until the first ArtNet data for it arrives. (The failsafe's poweroff
  still applies after reconnects once the light is being driven.)
• add could replace a config file it failed to read (permissions, disk error,
  non-UTF-8 bytes) with one containing only the new light; every read failure
  except "file does not exist" is now a hard error that leaves the file alone.
• A crashed per-light task now brings the bridge down with a clear error
  (restartable by a supervisor) instead of leaving that one light silently
  dead — stuck on its last colour, never reconnecting — while the bridge
  reported healthy.
• Status notifications with a valid-looking header but a corrupt body are now
  dropped: replies are checksum-verified whenever the complete frame is present
  (truncated notifications still decode, matching the official app's behaviour).
• The model catalog carried the CB200B Pro twice under two spellings; the
  duplicate is folded away (140 models) and a test now rejects any future
  case-insensitive duplicates.
• test --set rgbcw: accepted a brightness up to 255 and sent it as-is; it is
  now validated to the documented 0–100 like every other probe.
• A light name containing the DEL control character no longer makes add fail.
• ota: a resend request arriving before the first firmware block now re-sends
  the OTA header (bounded retries) instead of stalling into a timeout.