perf: numpy silence (drop 2nd ffmpeg pass) + phase timings

perf: numpy silence (drop 2nd ffmpeg pass) + phase timings

fix: use sched_getaffinity for container-aware CPU count

Fix: status bar instead of gr.Progress overlay, per-batch progress, total_rows from datasets-server

Fix: per-batch progress, detailed log, slim output schema

Phase 1: chunk music/quality classifier Space

initial commit