- Prefix front/uvicorn and re-emitted engine log lines with [HH:MM:SS] so the
  front log format matches the engine ([HH:MM:SS][nvidia] …); preserve tqdm
  in-place progress and avoid double-timestamping already-tagged lines.
- gpu_detect: _amd_gpu_name() resolves a card's marketing name via amdgpu
  product_name sysfs, then lspci board/chip name, then vulkaninfo.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>