fix: preserve all-tenant expiry scan

services/wallet-service/internal/service/wallet/red_packet.go

@@ -127,8 +127,12 @@ func (s *Service) ExpireRedPackets(ctx context.Context, appCode string, batchSiz
 	if s.repository == nil {
 		return ledger.RedPacketExpireResult{}, xerr.New(xerr.Unavailable, "wallet repository is not configured")
 	}
-	appCode = appcode.Normalize(appCode)
-	ctx = appcode.WithContext(ctx, appCode)
+	// 空 app_code 专用于内部 worker 的跨租户扫描；显式 RPC 仍归一化并保持单租户边界。
+	appCode = strings.ToLower(strings.TrimSpace(appCode))
+	if appCode != "" {
+		appCode = appcode.Normalize(appCode)
+		ctx = appcode.WithContext(ctx, appCode)
+	}
 	return s.repository.ExpireRedPackets(ctx, appCode, batchSize)
 }