Jakub Zych 237069c827 feat: revision-check material writes ...

- add jz_bm_materials.revision (default 1), read-only for GORM
- bump it only on content changes (models.ReviseMaterial)
- PUT /materials/{id} locks the row and answers 409 to a stale revision
- management answers carry revision and updated_at, the student detail
  carries revision

2026-11-08 23:33:34 +01:00

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