Marcel 323ec1ec54 feat(backend): add AdminController endpoints for thumbnail backfill
- POST /api/admin/generate-thumbnails  → triggers async backfill, 202
- GET  /api/admin/thumbnail-status     → returns current BackfillStatus

Both gated by the class-level @RequirePermission(Permission.ADMIN).
Shape and polling semantics mirror the mass-import endpoints.

Refs #307

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-22 22:05:47 +02:00
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