[management] Expire unvalidated custom domain registrations (#7497)

Prevent unvalidated registrations from reserving domain names indefinitely.

Give pending registrations a 48-hour validation window and clean up expired entries at startup and every 60 minutes. Emit CustomDomainValidationExpired for each deletion and preserve registrations referenced by services.

Reject validation after expiry and prevent concurrent validation from recreating deleted registrations. Normalize domain names with the shared parser before registration.

Migrate existing pending registrations to receive a fresh 48-hour validation window.

management/server/event.go

@@ -61,23 +61,34 @@ func (am *DefaultAccountManager) GetEvents(ctx context.Context, accountID, userI
 	return filtered, nil
 }
 
+// StoreEvent records an activity, waiting for expiration events before cleanup can stop.
 func (am *DefaultAccountManager) StoreEvent(ctx context.Context, initiatorID, targetID, accountID string, activityID activity.ActivityDescriber, meta map[string]any) {
-	if isEnabled() {
-		go func() {
-			_, err := am.eventStore.Save(ctx, &activity.Event{
-				Timestamp:   time.Now().UTC(),
-				Activity:    activityID.(activity.Activity),
-				InitiatorID: initiatorID,
-				TargetID:    targetID,
-				AccountID:   accountID,
-				Meta:        meta,
-			})
-			if err != nil {
-				// todo add metric
-				log.WithContext(ctx).Errorf("received an error while storing an activity event, error: %s", err)
-			}
-		}()
+	if !isEnabled() {
+		return
 	}
+	eventStore := am.eventStore
+	save := func(ctx context.Context) {
+		_, err := eventStore.Save(ctx, &activity.Event{
+			Timestamp:   time.Now().UTC(),
+			Activity:    activityID.(activity.Activity),
+			InitiatorID: initiatorID,
+			TargetID:    targetID,
+			AccountID:   accountID,
+			Meta:        meta,
+		})
+		if err != nil {
+			log.WithContext(ctx).Errorf("received an error while storing an activity event, error: %s", err)
+		}
+	}
+	if activityID == activity.CustomDomainValidationExpired {
+		// The domain is already deleted; shutdown must allow its audit write to finish.
+		ctx, cancel := context.WithTimeout(context.WithoutCancel(ctx), 5*time.Second)
+		defer cancel()
+		save(ctx)
+		return
+	}
+	// Request cancellation must not discard the audit record of a completed operation.
+	go save(context.WithoutCancel(ctx))
 }
 
 type eventUserInfo struct {