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/booking/planner/planner.go

@@ -84,7 +84,7 @@ func generate(request *tools.APIRequest, shallow bool) (*Planner, error) {
 
 		end := bk.ExpectedEndDate
 		if end == nil {
-			e := bk.ExpectedStartDate.UTC().Add(time.Hour)
+			e := bk.ExpectedStartDate.UTC().Add(5 * time.Minute)
 			end = &e
 		}
 
@@ -126,7 +126,7 @@ func generate(request *tools.APIRequest, shallow bool) (*Planner, error) {
 // If no capacity is known for this instance (never booked), it is fully available.
 func (p *Planner) Check(resourceID string, instanceID string, req *ResourceRequest, start time.Time, end *time.Time) bool {
 	if end == nil {
-		e := start.Add(time.Hour)
+		e := start.Add(5 * time.Minute)
 		end = &e
 	}