Audit log
- Add audit_log table (migration + schema) with index on created_at.
- Add auditLog service (writeAudit, getClientIp) and record events for backups
(create, restore, upload-restore, delete, auto-settings), admin actions
(users, OIDC, invites, system update, demo baseline, bag tracking, packing
template delete, addons), and auth (app settings, MFA enable/disable).
- Add GET /api/admin/audit-log with pagination; fix invite insert row id lookup.
- Add AuditLogPanel and Admin tab; adminApi.auditLog.
- Add admin.tabs.audit and admin.audit.* strings in all locale files.
Note: Rebase feature branches so new DB migrations stay after existing ones
(e.g. file_links) when merging upstream.
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