Close audit findings: anti-spoof client IP for login rate limit, JWT/CORS
enforce on startup, SSH host-key verification and sudo via stdin, optional
WinRM HTTPS, SSE httpOnly cookie auth, ingest body limit, ILIKE escaping,
and HMAC API key hashing with legacy SHA-256 fallback.
Add sac_users table, JWT roles, settings/users API guarded for admin, Users page in UI, and sac_manage_user.py CLI.
Co-authored-by: Cursor <cursoragent@cursor.com>