fix: route klog to stderr so k8s client errors are visible

cmd/gateway/main.go

@@ -11,6 +11,7 @@ import (
 
 	"k8s.io/client-go/dynamic"
 	"k8s.io/client-go/rest"
+	"k8s.io/klog/v2"
 
 	"forgejo.riotpiao.com/rock/homelab-frontend/internal/config"
 	"forgejo.riotpiao.com/rock/homelab-frontend/internal/proxy"
@@ -54,6 +55,10 @@ func main() {
 	healthChecker := server.NewHealthChecker(true, authEnabled)
 	srv.SetHealthChecker(healthChecker)
 
+	// Route klog (used by k8s client-go) to stderr so reflector errors are visible
+	klog.InitFlags(nil)
+	klog.SetOutput(os.Stderr)
+
 	// Create ServiceAdapter registry and dispatcher (phase 8)
 	registry := serviceadapter.NewRegistry(nil)
 	dispatcher := serviceadapter.NewDispatcher(registry)

go.mod

@@ -10,6 +10,7 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/apimachinery v0.37.0
 	k8s.io/client-go v0.37.0
+	k8s.io/klog/v2 v2.140.0
 )
 
 require (
@@ -63,7 +64,6 @@ require (
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	k8s.io/api v0.37.0 // indirect
-	k8s.io/klog/v2 v2.140.0 // indirect
 	k8s.io/kube-openapi v0.0.0-20260721132016-d427ff9ee9ad // indirect
 	k8s.io/utils v0.0.0-20260626114624-be93311217bd // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect