Pipeline:
- Switch to uridecodebin for robust dynamic pad linking
- Add queue(leaky=upstream) to decouple decoder from renderer
- Configure RTSP source via source-setup signal (TCP, latency≥50ms)
- Disable QoS on appsink to prevent upstream frame dropping
- Fix preroll deadlock with async=FALSE + remove false EOS check

Events:
- Bridge C++ pipeline callbacks to React Native via JNI reverse calls
- onPlaying now fires when pipeline actually reaches PLAYING state
- onError catches runtime errors from C++ bus thread
- onBuffering connected to GStreamer buffering messages

Docs:
- Default latency 25→50ms (min 50ms enforced)
- Default transport udp→tcp
- Updated props/events documentation across all layers
- Cleaned up verbose debug logging