feat: Implement a comprehensive two-factor authentication system including setup, verification, backup codes, and integration into the login flow.

src/app/(auth)/login/page.tsx

@@ -35,6 +35,17 @@ export default function LoginPage() {
         return;
       }
 
+      // Check if 2FA is required (response is wrapped in { success, data })
+      if (validateData.data?.requiresTwoFactor) {
+        // Redirect to 2FA verification page with tempToken
+        const params = new URLSearchParams({
+          token: validateData.data.tempToken,
+          email: email,
+        });
+        router.push(`/login/verify-2fa?${params.toString()}`);
+        return;
+      }
+
       // If validation passed, use NextAuth to create session
       const result = await signIn('credentials', {
         email,