Workflow lifecycle events + resource instance duration tracking

- Add WorkflowLifecycleEvent + StepMetric to tools/workflow_lifecycle.go
- Add WORKFLOW_STARTED_EVENT, WORKFLOW_STEP_DONE_EVENT, WORKFLOW_DONE_EVENT NATS methods
- ResourceInstance.UpdateAverageDuration for AverageDurationS running average
- Support Steps recap in WORKFLOW_DONE_EVENT for catch-up by oc-scheduler/oc-catalog

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

models/workflow_execution/workflow_execution.go

@@ -215,7 +215,14 @@ func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.
 		if s := priced.GetLocationStart(); s != nil && s.After(time.Now()) {
 			start = *s
 		}
-		end := start.Add(time.Duration(priced.GetExplicitDurationInS()) * time.Second)
+		durationS := priced.GetExplicitDurationInS()
+		var endDate *time.Time
+		if durationS >= 0 {
+			e := start.Add(time.Duration(durationS) * time.Second)
+			endDate = &e
+		}
+		// durationS < 0 means the resource is a service (runs indefinitely):
+		// leave ExpectedEndDate nil so the booking is open-ended.
 		var m map[string]interface{}
 		b, _ := json.Marshal(priced)
 		json.Unmarshal(b, &m)
@@ -235,7 +242,7 @@ func (d *WorkflowExecution) bookEach(executionsID string, wfID string, dt tools.
 			WorkflowID:        wfID,
 			ExecutionID:       d.GetID(),
 			ExpectedStartDate: start,
-			ExpectedEndDate:   &end,
+			ExpectedEndDate:   endDate,
 		}
 		items = append(items, bookingItem)
 		d.PeerBookByGraph[priced.GetCreatorID()][itemID] = append(