Stop exposing raw reason codes like admin_not_found in TOTP setup errors;
auth routes and JWT guard now use Chinese literals with auth_failure_detail.
Co-authored-by: Cursor <cursoragent@cursor.com>
Add a global detail translator for common 4xx messages (Server not found,
auth headers, settings not found, etc.) while keeping /api/agent/* in English.
Co-authored-by: Cursor <cursoragent@cursor.com>
Nexus Agent