fix: direct K8s scaling, replicas from K8s API, button labels, modify fetch

- Add ScaleClient using K8s API (like kubectl scale deploy --replicas=N)
  - ScaleDeployment: patch Deployment.Spec.Replicas directly
  - GetDeploymentReplicas: query actual K8s deployment replicas
  - Search by labels then fallback to deployment name match
- Wire ScaleClient to InstanceService via SetScaleClient in main.go
- ModifyModal: fetch full instance detail on open (list excludes values)
- InstanceCard: add text labels to action buttons (Entries/Diag/Modify/Delete)
  - Text visible on sm+ screens, icon-only on xs

backend/internal/adapter/input/http/rest/instance_handler.go

@@ -566,17 +566,6 @@ func formatTime(value time.Time) string {
 }
 
 func convertInstanceResponse(instance *entity.Instance, includeValues bool) *dto.InstanceResponse {
-	replicas := 0
-	if v, ok := instance.Values["replicaCount"]; ok {
-		switch n := v.(type) {
-		case float64:
-			replicas = int(n)
-		case int:
-			replicas = n
-		case int64:
-			replicas = int(n)
-		}
-	}
 	response := &dto.InstanceResponse{
 		ID:             instance.ID,
 		ClusterID:      instance.ClusterID,
@@ -594,7 +583,7 @@ func convertInstanceResponse(instance *entity.Instance, includeValues bool) *dto
 		LastOperation:  string(instance.LastOperation),
 		LastError:      instance.LastError,
 		Revision:       instance.Revision,
-		Replicas:       replicas,
+		Replicas:       0,
 		AllowedActions: []string{"view", "update", "delete"},
 		CreatedAt:      instance.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
 		UpdatedAt:      instance.UpdatedAt.Format("2006-01-02T15:04:05Z07:00"),