Query images attached to a retrieval test vanished as soon as the run's
history record was selected, and were never shown again after a reload,
because nothing persisted them: the gateway dropped `queryImages` when writing
`answer_traces`, the console trace/research responses had no image field, and
the composer cleared its images on every record selection.
- knowledge-fs: add a nullable JSON `query_images` column to `answer_traces`
(migration 0049 for postgres and tidb), persist and read it in the answer
trace repository, and expose `queryImages` on quality trace list items.
- api: enrich trace and research task responses with
`KnowledgeFSQueryImageResponse`, resolving file names and short-lived signed
preview URLs only for files the acting account still owns; regenerate the
console and service contracts.
- web: keep composer images scoped to the selected record like the query
text, remember images per run in this session, fall back to persisted
previews (with a labelled placeholder when the file is gone), show them in
the result panel and as a count on history records, and carry them into
retests.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015zw5G5SX3HmVfnZof6YWAc
