M4-T08: add two-step login and TOTP settings panel (qrcode.react)

frontend/src/pages/ConfigPage.tsx

@@ -35,6 +35,7 @@ import {
 } from '@mantine/core'
 import apiClient, { ApiError } from '../api/client'
 import type { components } from '../api/schema.d.ts'
+import { TotpSettings } from './TotpSettings'
 
 // ---------------------------------------------------------------------------
 // Types
@@ -393,6 +394,11 @@ export function ConfigPage() {
           </Text>
         </Stack>
       )}
+
+      {/* TOTP two-factor auth management */}
+      <Stack mt="xl">
+        <TotpSettings />
+      </Stack>
     </Container>
   )
 }