DRY pass follow-up (note #1026). Five handlers returned the identical
jsonify({task_id, status:queued}), 202 shape; extract _queued(async_result).
Consumers routed through it: tags_normalize (live branch), trigger_reextract_archives,
trigger_prune_missing_files, trigger_dedup_videos, trigger_purge_gated_previews.
trigger_vacuum stays bespoke (returns no task_id — the UI doesn't poll it).
Added route-level tests for all five consumers (these trigger endpoints had no
route coverage before): 202 + task_id via _queued, and the dry_run flag threading
through to dedup/purge-gated. Behavior unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
6599a07468