feat(EE): MFA implementation for enterprise edition

- Add TOTP-based two-factor authentication
- Add backup codes support
- Add MFA enforcement at workspace level
- Add MFA setup and challenge UI pages
- Support MFA for login and password reset flows
- Add MFA validation for secure pages

apps/client/src/lib/app-route.ts

@@ -8,6 +8,8 @@ const APP_ROUTE = {
     PASSWORD_RESET: "/password-reset",
     CREATE_WORKSPACE: "/create",
     SELECT_WORKSPACE: "/select",
+    MFA_CHALLENGE: "/login/mfa",
+    MFA_SETUP_REQUIRED: "/login/mfa/setup",
   },
   SETTINGS: {
     ACCOUNT: {