Maintainer pre-merge review follow-up (all non-blocker dead code):
F1: delete the dead S3-backup remnants (validation, query hooks, S3-only query
key, BackupS3Model/Settings types) — kept the CE file-backup path.
F2: delete the orphaned user-activity services + their registration (kept the
notifications component and routes).
F3: drop the unused buildOpenLDAPSettingsModel().
F4: drop the dead one-option ldap-options data (the selector was already collapsed).
F5: remove the dead data-edition attribute + its process.env typing; silence the
intentional hasAuthorizations unused-params; drop the dead useRolesState meta.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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