fix(activity): skip zero heat gift growth events

services/activity-service/internal/service/growth/service.go

@@ -260,9 +260,13 @@ func (s *Service) HandleRoomEvent(ctx context.Context, envelope *roomeventsv1.Ev
 	if gift.GetIsRobotGift() {
 		return 0, nil
 	}
-	if gift.GetSenderUserId() <= 0 || gift.GetTargetUserId() <= 0 || gift.GetGiftValue() <= 0 {
+	if gift.GetSenderUserId() <= 0 || gift.GetTargetUserId() <= 0 || gift.GetGiftValue() < 0 {
 		return 0, xerr.New(xerr.InvalidArgument, "room gift event is incomplete")
 	}
+	if gift.GetGiftValue() == 0 {
+		// 低价幸运礼物按房间贡献比例折算后可能为 0；这是合法结算结果，增长服务只确认事件并跳过等级增量。
+		return 0, nil
+	}
 	dimensions, err := roomGiftDimensions(envelope, &gift)
 	if err != nil {
 		return 0, err

services/activity-service/internal/service/growth/service_test.go

@@ -138,6 +138,40 @@ func TestGrowthRoomGiftEventFeedsWealthAndCharm(t *testing.T) {
 	}
 }
 
+func TestGrowthRoomGiftEventSkipsZeroGiftValue(t *testing.T) {
+	svc, _ := newGrowthService(t)
+	ctx := appcode.WithContext(context.Background(), "lalu")
+
+	body, err := proto.Marshal(&activityevents.RoomGiftSent{
+		SenderUserId:     20001,
+		TargetUserId:     20002,
+		GiftId:           "gift-zero-heat",
+		GiftCount:        1,
+		GiftValue:        0,
+		BillingReceiptId: "bill-zero-heat",
+		VisibleRegionId:  86,
+		CommandId:        "cmd-gift-zero-heat",
+	})
+	if err != nil {
+		t.Fatalf("marshal zero heat room gift failed: %v", err)
+	}
+	consumed, err := svc.HandleRoomEvent(ctx, &activityevents.EventEnvelope{
+		EventId:      "room-gift-event-zero-heat",
+		RoomId:       "room-1",
+		EventType:    "RoomGiftSent",
+		RoomVersion:  8,
+		OccurredAtMs: fixedGrowthNow().UnixMilli(),
+		Body:         body,
+		AppCode:      "lalu",
+	})
+	if err != nil {
+		t.Fatalf("zero heat RoomGiftSent should be accepted and skipped: %v", err)
+	}
+	if consumed != 0 {
+		t.Fatalf("zero heat RoomGiftSent should not create growth events, consumed=%d", consumed)
+	}
+}
+
 func TestListLevelConfigReturnsAdminRulesAndTiers(t *testing.T) {
 	svc, _ := newGrowthService(t)
 	ctx := appcode.WithContext(context.Background(), "lalu")