test: fix grok oauth validation suite

backend/internal/handler/openai_images_failover_test.go

@@ -136,6 +136,7 @@ func TestOpenAIGatewayHandlerImages_ServerErrorFailsOverAndReturnsClearErrorWhen
 		nil,
 		nil,
 		nil,
+		nil,
 	)
 	billingService := service.NewBillingCacheService(nil, nil, nil, nil, nil, nil, cfg, nil)
 	t.Cleanup(billingService.Stop)

backend/internal/repository/grok_oauth_client_test.go

@@ -100,7 +100,7 @@ func TestGrokOAuthClientStatusErrorRedactsSensitiveResponseBody(t *testing.T) {
 
 	errText := err.Error()
 	require.Contains(t, errText, "status 400")
-	require.Contains(t, errText, `"refresh_token":"***"`)
+	require.Contains(t, errText, `\"refresh_token\":\"***\"`)
 	require.NotContains(t, errText, "access-secret")
 	require.NotContains(t, errText, "refresh-secret")
 	require.NotContains(t, errText, "verifier-secret")