Daniel Legt eff831b142 feat(backend): implement on-demand thumbnail generation ...

When a thumbnail is requested but not yet available, attempt to generate
it synchronously on-demand instead of immediately falling back to the
placeholder image.

- Export thumbnail generation helpers from the jobs package.
- Update the Thumbnail handler to trigger on-demand generation if the
  thumbnail object is missing.
- Save the updated box metadata with the new thumbnail reference.
- Fall back to the placeholder image only if on-demand generation fails.

2026-06-03 15:20:26 +03:00

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