- Add Unknown39 and Unknown40 functions to BSD service for [20.0.0+]
- Implement bsd:nu service with ISfUserService and ISfAssignedNetworkInterfaceService
- Add dns:priv and ethc:c/ethc:i service stubs
- Update CMakeLists.txt to include new socket service files
- All new functions include basic stub implementations following existing patterns
This completes the socket services implementation based on switchbrew.org documentation.
Signed-off-by: Zephyron <zephyron@citron-emu.org>
