Changes:
- RTSP now generates single URL based on credentials availability
* With credentials: only rtsp://user:pass@host/path
* Without credentials: only rtsp://host/path
- HTTP/HTTPS unchanged: still generates 4 auth variants
- Improved deduplication efficiency from 66% to 100% for RTSP
- Added comprehensive test coverage for protocol auth behavior
This reduces unnecessary stream testing and improves discovery speed
eduard256