feat(订单): 实现推荐奖励系统支持佣金和赠送天数两种模式

重构推荐奖励处理逻辑，新增支持根据配置选择佣金奖励或赠送天数奖励
修改Discount相关字段类型为float64以支持小数折扣
添加GiftDays配置项控制赠送天数
新增FindActiveSubscribe方法查询用户有效订阅

queue/logic/order/activateOrderLogic.go

@@ -179,8 +179,8 @@ func (l *ActivateOrderLogic) NewPurchase(ctx context.Context, orderInfo *order.O
 		return err
 	}
 
-	// Handle commission in separate goroutine to avoid blocking
-	go l.handleCommission(context.Background(), userInfo, orderInfo)
+	// Handle referral reward in separate goroutine to avoid blocking
+	go l.handleReferralReward(context.Background(), userInfo, orderInfo)
 
 	// Clear cache
 	l.clearServerCache(ctx, sub)
@@ -349,10 +349,12 @@ func (l *ActivateOrderLogic) createUserSubscription(ctx context.Context, orderIn
 	return userSub, nil
 }
 
-// handleCommission processes referral commission for the referrer if applicable.
+// handleReferralReward processes referral rewards for the referrer if applicable.
 // This runs asynchronously to avoid blocking the main order processing flow.
-func (l *ActivateOrderLogic) handleCommission(ctx context.Context, userInfo *user.User, orderInfo *order.Order) {
-	if !l.shouldProcessCommission(userInfo, orderInfo.IsNew) {
+// If referral percentage > 0: commission reward
+// If referral percentage = 0: gift days to both parties
+func (l *ActivateOrderLogic) handleReferralReward(ctx context.Context, userInfo *user.User, orderInfo *order.Order) {
+	if !l.shouldProcessReferralReward(userInfo, orderInfo.IsNew) {
 		return
 	}
 
@@ -372,13 +374,25 @@ func (l *ActivateOrderLogic) handleCommission(ctx context.Context, userInfo *use
 		referralPercentage = uint8(l.svc.Config.Invite.ReferralPercentage)
 	}
 
+	// Check if this is commission reward or gift days reward
+	if referralPercentage > 0 {
+		// Commission reward mode
+		l.processCommissionReward(ctx, referer, orderInfo, referralPercentage)
+	} else {
+		// Gift days reward mode
+		l.processGiftDaysReward(ctx, referer, userInfo, orderInfo)
+	}
+}
+
+// processCommissionReward handles commission-based rewards
+func (l *ActivateOrderLogic) processCommissionReward(ctx context.Context, referer *user.User, orderInfo *order.Order, percentage uint8) {
 	// Order commission calculation： (Order Amount - Order Fee) * Referral Percentage
-	amount := l.calculateCommission(orderInfo.Amount-orderInfo.FeeAmount, referralPercentage)
+	amount := l.calculateCommission(orderInfo.Amount-orderInfo.FeeAmount, percentage)
 
 	// Use transaction for commission updates
-	err = l.svc.DB.Transaction(func(tx *gorm.DB) error {
+	err := l.svc.DB.Transaction(func(tx *gorm.DB) error {
 		referer.Commission += amount
-		if err = l.svc.UserModel.Update(ctx, referer, tx); err != nil {
+		if err := l.svc.UserModel.Update(ctx, referer, tx); err != nil {
 			return err
 		}
 
@@ -420,9 +434,73 @@ func (l *ActivateOrderLogic) handleCommission(ctx context.Context, userInfo *use
 	}
 }
 
-// shouldProcessCommission determines if commission should be processed based on
+// processGiftDaysReward handles gift days rewards for both parties
+func (l *ActivateOrderLogic) processGiftDaysReward(ctx context.Context, referer *user.User, referee *user.User, orderInfo *order.Order) {
+	giftDays := l.svc.Config.Invite.GiftDays
+	if giftDays <= 0 {
+		giftDays = 3 // Default to 3 days
+	}
+
+	// Get the subscription info to determine the unit time
+	sub, err := l.getSubscribeInfo(ctx, orderInfo.SubscribeId)
+	if err != nil {
+		logger.WithContext(ctx).Error("Get subscribe info failed for gift days",
+			logger.Field("error", err.Error()),
+			logger.Field("subscribe_id", orderInfo.SubscribeId),
+		)
+		return
+	}
+
+	// Grant gift days to both referer and referee
+	l.grantGiftDays(ctx, referer, giftDays, sub.UnitTime, "referer")
+	l.grantGiftDays(ctx, referee, giftDays, sub.UnitTime, "referee")
+}
+
+// grantGiftDays grants gift days to a user by extending their subscription
+func (l *ActivateOrderLogic) grantGiftDays(ctx context.Context, user *user.User, days int64, unitTime string, role string) {
+	// Find user's active subscription
+	userSub, err := l.svc.UserModel.FindActiveSubscribe(ctx, user.Id)
+	if err != nil {
+		logger.WithContext(ctx).Error("Find user active subscription failed for gift days",
+			logger.Field("error", err.Error()),
+			logger.Field("user_id", user.Id),
+			logger.Field("role", role),
+		)
+		return
+	}
+
+	if userSub == nil {
+		logger.WithContext(ctx).Info("User has no active subscription for gift days",
+			logger.Field("user_id", user.Id),
+			logger.Field("role", role),
+		)
+		return
+	}
+
+	// Extend subscription by gift days
+	userSub.ExpireTime = tool.AddTime("day", days, userSub.ExpireTime)
+
+	err = l.svc.UserModel.UpdateSubscribe(ctx, userSub)
+	if err != nil {
+		logger.WithContext(ctx).Error("Update user subscription for gift days failed",
+			logger.Field("error", err.Error()),
+			logger.Field("user_id", user.Id),
+			logger.Field("role", role),
+		)
+		return
+	}
+
+	logger.WithContext(ctx).Info("Gift days granted successfully",
+		logger.Field("user_id", user.Id),
+		logger.Field("role", role),
+		logger.Field("days", days),
+		logger.Field("new_expire_time", userSub.ExpireTime),
+	)
+}
+
+// shouldProcessReferralReward determines if referral reward should be processed based on
 // referrer existence, commission settings, and order type
-func (l *ActivateOrderLogic) shouldProcessCommission(userInfo *user.User, isFirstPurchase bool) bool {
+func (l *ActivateOrderLogic) shouldProcessReferralReward(userInfo *user.User, isFirstPurchase bool) bool {
 	if userInfo == nil || userInfo.RefererId == 0 {
 		return false
 	}
@@ -504,8 +582,8 @@ func (l *ActivateOrderLogic) Renewal(ctx context.Context, orderInfo *order.Order
 	// Clear cache
 	l.clearServerCache(ctx, sub)
 
-	// Handle commission
-	go l.handleCommission(context.Background(), userInfo, orderInfo)
+	// Handle referral reward
+	go l.handleReferralReward(context.Background(), userInfo, orderInfo)
 
 	// Send notifications
 	l.sendNotifications(ctx, orderInfo, userInfo, sub, userSub, telegram.RenewalNotify)