fix: recover gateway callbacks and client send flows

gateway/internal/resultoutbox/worker.go

@@ -43,12 +43,24 @@ func (o *Outbox) Run(ctx context.Context) error {
 	if strings.TrimSpace(o.APIBaseURL) == "" {
 		return fmt.Errorf("result Outbox API base URL is required")
 	}
+	if o.BatchEnabled {
+		return retryUntilCanceled(ctx, time.Second, func() error {
+			if err := o.ensureGroup(ctx); err != nil {
+				log.Printf("gateway result Outbox group initialization failed: %v", err)
+				return err
+			}
+			if err := o.runBatches(ctx); err != nil && ctx.Err() == nil {
+				// A transient Redis read error must not permanently stop the only
+				// consumer for submit results, receipts, and uplink events.
+				log.Printf("gateway result Outbox batch consume failed: %v", err)
+				return err
+			}
+			return ctx.Err()
+		})
+	}
 	if err := o.ensureGroup(ctx); err != nil {
 		return err
 	}
-	if o.BatchEnabled {
-		return o.runBatches(ctx)
-	}
 	pool := newCallbackPool(ctx, o, o.concurrency())
 	defer pool.wait()
 	for {
@@ -276,3 +288,12 @@ func sleep(ctx context.Context, duration time.Duration) {
 	case <-timer.C:
 	}
 }
+
+func retryUntilCanceled(ctx context.Context, delay time.Duration, operation func() error) error {
+	for ctx.Err() == nil {
+		if err := operation(); err != nil && ctx.Err() == nil {
+			sleep(ctx, delay)
+		}
+	}
+	return ctx.Err()
+}