- Fix encoder PTS: use wall-clock relative timestamps to prevent backward
jumps when transitioning from standby to game frames (MediaCodec drops)
- Suppress standby frames while game is active (500ms timeout) to prevent
flickering between game video and color bars
- Remove standby color bar pattern, use plain dark background
- Fix vertical flip and BGR→RGB swizzle in composition base pass shader
- Pass buffer index through native pipeline for pool slot release callback
- Start engine for already-LIVE plans when APP_STREAMING mode is active
- Use texture pool dimensions for encoder resolution instead of hardcoded 1920x1080