BFplayer v0.1.0-alpha.42 Test Build

This test build fixes the playback regression reported after alpha.39 and
finishes the measured 4K path.

• Fixed fast playback, pause-clock drift, and post-seek frame drops
• Uses 1080p output for normal media and native 3840x2160 for larger sources
• Reduced 4K presentation overhead with persistent workers and pipelined flips
• Added PQ/HLG HDR to BT.709 SDR tone mapping for the current PS5 output path
• Added detailed timing, queue, CPU, memory, I/O, display, and HDR diagnostics

Final PS5 checks passed: the 4K60 VP9/PQ sample reached 38.33 delivered FPS,
HDR tone mapping averaged 2.70 ms per frame, the 1080p sample held 24 FPS,
pause drift was zero, and both seek tests recovered. The standalone and websrv
packages contain the same player ELF.