Fix biometric auth TypeScript errors

- Add LOGIN_BIOMETRIC to AuditAction enum
- Import AuditAction and EntityType in AuthService
- Fix loginWithExternalAuth return type to match AuthResponse interface
- Update biometric API client to use correct response structure
- Update login page to access tokens from nested data structure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/app/(auth)/login/page.tsx

@@ -91,7 +91,7 @@ export default function LoginPage() {
       );
 
       // Store tokens and navigate
-      tokenStorage.setTokens(result.tokens.accessToken, result.tokens.refreshToken);
+      tokenStorage.setTokens(result.data.tokens.accessToken, result.data.tokens.refreshToken);
       router.push('/');
     } catch (err: any) {
       console.error('Biometric login failed:', err);