042aab7199
Add shared DecodedMessage enum (tagged serde), AprsPacket and CwEvent types for server-side decoding. Add AUDIO_MSG_APRS_DECODE (0x03) and AUDIO_MSG_CW_DECODE (0x04) wire protocol constants. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>