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/server/package.json

@@ -71,6 +71,7 @@
     "nestjs-kysely": "^1.2.0",
     "nodemailer": "^7.0.3",
     "openid-client": "^5.7.1",
+    "otpauth": "^9.4.0",
     "passport-google-oauth20": "^2.0.0",
     "passport-jwt": "^4.0.1",
     "pg": "^8.16.0",