Two features: multi-vendor admin management (invite/create, remove,
reset password/MFA) and shared account settings page (profile, password
change with current-password verification, MFA self-service). Includes
consolidation plan extracting user-level identity operations from
TenantPortalService into new AccountService.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>