fix: IAP attach 后立即清除订阅缓存，修复 App 查到旧数据；返回值改用累计到期时间

Co-Authored-By: claude-flow <ruv@ruv.net>

internal/logic/public/iap/apple/attachTransactionLogic.go

@@ -427,9 +427,37 @@ func (l *AttachTransactionLogic) Attach(req *types.AttachAppleTransactionRequest
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseInsertError), "insert error: %v", err.Error())
 	}
 	l.sendIAPAttachTraceToTelegram("SUCCESS_COMMIT", orderInfo, u.Id, subscribeId, tier, duration, txPayload.PurchaseDate, txPayload.TransactionId, txPayload.OriginalTransactionId, "")
-	l.Infow("绑定完成", logger.Field("userId", u.Id), logger.Field("tier", tier), logger.Field("expiresAt", exp.Unix()))
+
+	// 事务提交后立即清除订阅缓存，避免 App 查到旧数据（激活队列异步执行，存在竞态）
+	if orderLinkedSub != nil {
+		_ = l.svcCtx.UserModel.ClearSubscribeCache(l.ctx, orderLinkedSub)
+	} else if singleModeAnchorSub != nil {
+		_ = l.svcCtx.UserModel.ClearSubscribeCache(l.ctx, singleModeAnchorSub)
+	}
+
+	// merged 路径下，exp 仅从购买日算起，需要用已有订阅到期时间 + duration 作为预估值返回前端
+	responseExpire := exp
+	var mergeSub *user.Subscribe
+	if orderLinkedSub != nil {
+		mergeSub = orderLinkedSub
+	} else if singleModeAnchorSub != nil {
+		mergeSub = singleModeAnchorSub
+	}
+	if mergeSub != nil {
+		base := mergeSub.ExpireTime
+		now := time.Now()
+		if base.Before(now) {
+			base = now
+		}
+		estimated := base.AddDate(0, 0, int(duration))
+		if estimated.After(responseExpire) {
+			responseExpire = estimated
+		}
+	}
+
+	l.Infow("绑定完成", logger.Field("userId", u.Id), logger.Field("tier", tier), logger.Field("expiresAt", responseExpire.Unix()))
 	return &types.AttachAppleTransactionResponse{
-		ExpiresAt: exp.Unix(),
+		ExpiresAt: responseExpire.Unix(),
 		Tier:      tier,
 	}, nil
 }