When switching from MPV to AVPlayer, prioritize HLS and stream formats over non-streamable MP4/AVC1 formats to avoid long loading times.
Changes:
- Added isFastLoadingFormat() helper to AVPlayerBackend
- Modified streamByQualityProfile to prefer fast-loading formats for AVPlayer
- Falls back to non-streamable formats only if no fast-loading option exists
- Ensures quick backend switching without waiting for metadata download