GET /api/inference/images/info returns each family's bf16 component sizes and
the estimated resident GB under bf16/int8/fp8/mxfp8/nvfp4, computed purely from
the auto-policy tables (no GPU probing, torch-free), so the panel can show the
Dtype tradeoff before anything is loaded.
DiffusionStatusResponse gains an additive resolved field: per-control
{value, source, reason} provenance the loader already records. The Advanced
panel renders a muted Auto: X pill next to Speed / Dtype / Attention / Memory /
Step cache / CPU offload when the backend decided that control (source auto),
with the reason as the tooltip; an explicit user choice renders no badge.
