v1.0.10

v1.0.10 — visualize/volume + metadata persist + catalog routes

Three real-world bugs fixed:

  - /v1/audio/visualize/video/volume: ffmpeg showvolume size arg
    style ("s=WxH" → "w=W:h=H").
  - /v1/audio/metadata write mode: now actually persists tagged
    audio to output_path / output_url (additive — old call shape
    still works, flagged persisted=false in the response).
  - /v1/catalog paths: /v1/audio/batch → /v1/batch and
    /v1/audio/diarize → /v1/audio/diarize/{engine}; new consistency
    test guards future drift.