- Add debug logging for all control channel messages in wssshd and wssshc
  when --debug flag is enabled, showing full JSON content of received and sent messages
- Fix data forwarding issue in wsssht script mode
- Suppress data channel message output in wsssht script mode for cleaner output
- Enhance script_started message in wsssht script mode to include tunnel_host, tunnel_port, and service fields
- Remove obsolete test_bridge_interactive.sh file

Control channel messages now logged include: register, registered, registration_error,
tunnel_request, tunnel_ack, tunnel_close, tunnel_error for both server and client.