- Add DiscoverOptions struct with NetworkInterface field
- Add DiscoverWithOptions() function for interface-specific discovery
- Add ListNetworkInterfaces() to enumerate available interfaces
- Add resolveNetworkInterface() helper supporting names and IPs
- Maintain full backward compatibility with existing Discover() function
- Support specifying interface by name (eth0, wlan0) or IP address
- Provide helpful error messages listing available interfaces
- Comprehensive test suite with 6 unit tests + 2 benchmarks
- Add NETWORK_INTERFACE_GUIDE.md with usage examples
This addresses issue where users with multiple active network interfaces
need to explicitly select which interface to use for WS-Discovery multicast,
as auto-detection may select the wrong one.
ProtoTess