Suppress tunnel_data debug messages in wsssht --debug mode

- Suppress verbose tunnel_data debug messages in main tunnel loop
- Suppress tunnel_data debug messages in thread function
- Suppress tunnel_data debug messages in daemon mode
- Suppress WebSocket 'Received message' and 'Processing message' debug messages for tunnel_data
- Maintain functionality while reducing debug log verbosity
- Preserve other debug messages (tunnel_response, tunnel_close, etc.)