fix(gateway): normalize model alias billing identity

apps/api/internal/store/tasks_runtime.go

@@ -687,11 +687,16 @@ func (s *Store) SettleTaskBilling(ctx context.Context, task GatewayTask) error {
 	if currency == "" || currency == "mixed" {
 		currency = "resource"
 	}
+	modelIdentity := taskBillingModelIdentity(task)
 	metadataMap := map[string]any{
 		"taskId":         task.ID,
 		"kind":           task.Kind,
-		"model":          task.Model,
-		"resolvedModel":  task.ResolvedModel,
+		"model":          modelIdentity.Model,
+		"requestedModel": modelIdentity.RequestedModel,
+		"resolvedModel":  modelIdentity.ResolvedModel,
+		"modelName":      modelIdentity.ModelName,
+		"modelAlias":     modelIdentity.ModelAlias,
+		"providerModel":  modelIdentity.ProviderModelName,
 		"billings":       task.Billings,
 		"billingSummary": task.BillingSummary,
 	}
@@ -814,7 +819,7 @@ func roundMoney(value float64) float64 {
 
 func taskBillingString(value any) string {
 	if text, ok := value.(string); ok {
-		return text
+		return strings.TrimSpace(text)
 	}
 	return ""
 }