The merged PR left the review-queue's mutating endpoints ungated. Both now require
admin, matching the Phase 3 destructive-endpoint convention:
- /api/verification/<id>/delete (os.remove + drops the history row) — @admin_only,
so a non-admin on a login/multi-profile instance can't delete library files.
- /api/verification/<id>/approve (flips verification_status + writes the tag) —
@admin_only; also wrapped its DB writes in `with db._get_connection()` for
rollback-on-error + codebase consistency (was a bare conn).
Read/playback endpoints (stream/play/compare/entry/config) stay open — the app's
LAN-read model. Tests: non-admin gets 403 on delete + approve; admin isn't blocked.
