fix: real K8s replicas in list API, full Helm values in modify YAML editor

- Add Replicas field to entity.Instance
- Add EnrichReplicas to InstanceService (batch K8s deployment query)
- convertInstanceResponse uses instance.Replicas instead of hardcoded 0
- ModifyModal: load full Helm values from values-diff API (Current deployed)
- Remove stale loadValuesDiff, use single useEffect for all data loading
- Fix YAML lineWidth:0 for no line wrapping

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

@@ -139,6 +139,9 @@ func (h *InstanceHandler) ListInstances(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
+	// Enrich with running replicas from K8s
+	instances = h.instanceService.EnrichReplicas(r.Context(), clusterID, instances)
+
 	responses := make([]*dto.InstanceResponse, 0, len(instances))
 	for _, instance := range instances {
 		responses = append(responses, convertInstanceResponse(instance, false))
@@ -586,7 +589,7 @@ func convertInstanceResponse(instance *entity.Instance, includeValues bool) *dto
 		LastOperation:  string(instance.LastOperation),
 		LastError:      instance.LastError,
 		Revision:       instance.Revision,
-		Replicas:       0,
+		Replicas:       instance.Replicas,
 		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"),