GET /api/v1/jobs now queries the proxy, thumbnail, and conform BullMQ
queues directly and returns normalized job objects with id, type,
status, progress, asset_id, timestamps, and error fields.
Also adds DELETE /:id to remove completed/failed jobs from the queue,
supporting the clearCompleted action in jobs.html.
The PostgreSQL jobs table is still used only for conform job creation
(POST /conform) to preserve that workflow.
