Complete the rename by updating:
- DeviceCatalogs struct field: BookmannUuid → BookhoardUuid (models.go)
- Generated queries: Update all references (queries.sql.go)
- Local variables: bookmannUUID → bookhoardUUID (kobo.go)
- Struct field access: catalog.BookmannUuid → catalog.BookhoardUuid
All "bookmann" and "BOOKMANN" references are now eliminated from the codebase.
Part of project rename to Bookhoard.