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Aligns the auth-account table name with the AppUser entity. The historical mismatch (table 'users' alongside table 'persons') misled schema-first readers into assuming the two were related; renaming to 'app_users' makes the deliberate split between auth accounts and historical persons explicit at the schema layer. Scope: the table itself, the users_groups join table, and the three FK columns whose name was literally 'user_id'. Semantic FK columns (audit_log.actor_id, notifications.recipient_id, document_versions.editor_id, etc.) keep their names — the role they describe is the documentation, not the type. Closes #418. Unblocks #407 (REFACTOR-1). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>