- Add trap.rs with BER/ASN.1 parser for SNMP trap PDUs
- Support both SNMPv1 and SNMPv2c trap formats
- Listen on configurable UDP port (default 162)
- Log received traps at INFO level
- Add LOG_LEVEL env var for log verbosity control
- Add TRAP_PORT env var and CLI flag
- Update docker-compose with trap port mapping