优化小程序阅读页面，新增好友优惠展示逻辑，支持通过推荐人获取折扣。调整价格计算方式，确保用户在购买章节时能看到实际优惠。更新相关样式以提升用户体验。

soul-api/internal/handler/miniprogram.go

@@ -194,10 +194,34 @@ func miniprogramPayPost(c *gin.Context) {
 	}
 
 	db := database.DB()
-	
-	// 获取推广配置计算好友优惠
+
+	// 查询用户的有效推荐人（先查 binding，再查 referralCode）
+	var referrerID *string
+	if req.UserID != "" {
+		var binding struct {
+			ReferrerID string `gorm:"column:referrer_id"`
+		}
+		err := db.Raw(`
+			SELECT referrer_id
+			FROM referral_bindings
+			WHERE referee_id = ? AND status = 'active' AND expiry_date > NOW()
+			ORDER BY binding_date DESC
+			LIMIT 1
+		`, req.UserID).Scan(&binding).Error
+		if err == nil && binding.ReferrerID != "" {
+			referrerID = &binding.ReferrerID
+		}
+	}
+	if referrerID == nil && req.ReferralCode != "" {
+		var refUser model.User
+		if err := db.Where("referral_code = ?", req.ReferralCode).First(&refUser).Error; err == nil {
+			referrerID = &refUser.ID
+		}
+	}
+
+	// 有推荐人时应用好友优惠（无论是 binding 还是 referralCode）
 	finalAmount := req.Amount
-	if req.ReferralCode != "" {
+	if referrerID != nil {
 		var cfg model.SystemConfig
 		if err := db.Where("config_key = ?", "referral_config").First(&cfg).Error; err == nil {
 			var config map[string]interface{}
@@ -233,33 +257,6 @@ func miniprogramPayPost(c *gin.Context) {
 		clientIP = "127.0.0.1"
 	}
 
-	// 查询用户的有效推荐人
-	var referrerID *string
-	if req.UserID != "" {
-		var binding struct {
-			ReferrerID string `gorm:"column:referrer_id"`
-		}
-		err := db.Raw(`
-			SELECT referrer_id
-			FROM referral_bindings
-			WHERE referee_id = ? AND status = 'active' AND expiry_date > NOW()
-			ORDER BY binding_date DESC
-			LIMIT 1
-		`, req.UserID).Scan(&binding).Error
-		
-		if err == nil && binding.ReferrerID != "" {
-			referrerID = &binding.ReferrerID
-		}
-	}
-
-	// 如果没有绑定，尝试从邀请码解析推荐人
-	if referrerID == nil && req.ReferralCode != "" {
-		var refUser model.User
-		if err := db.Where("referral_code = ?", req.ReferralCode).First(&refUser).Error; err == nil {
-			referrerID = &refUser.ID
-		}
-	}
-
 	// 插入订单到数据库
 	userID := req.UserID
 	if userID == "" {
@@ -472,7 +469,7 @@ func MiniprogramPayNotify(c *gin.Context) {
 				"user_id = ? AND product_type = ? AND product_id = ? AND status = 'created' AND order_sn != ?",
 				buyerUserID, attach.ProductType, productID, orderSn,
 			).Delete(&model.Order{})
-			processReferralCommission(db, buyerUserID, totalAmount, orderSn)
+			processReferralCommission(db, buyerUserID, totalAmount, orderSn, &order)
 		}
 		return nil
 	})
@@ -492,9 +489,11 @@ func MiniprogramPayNotify(c *gin.Context) {
 }
 
 // 处理分销佣金
-func processReferralCommission(db *gorm.DB, buyerUserID string, amount float64, orderSn string) {
-	// 获取分成配置，默认 90%
+// amount 为实付金额（若有好友优惠则已打折）；order 用于判断是否有推荐人从而反推原价
+func processReferralCommission(db *gorm.DB, buyerUserID string, amount float64, orderSn string, order *model.Order) {
+	// 获取分成配置，默认 90%；好友优惠用于反推原价（佣金按原价计算）
 	distributorShare := 0.9
+	userDiscount := 0.0
 	var cfg model.SystemConfig
 	if err := db.Where("config_key = ?", "referral_config").First(&cfg).Error; err == nil {
 		var config map[string]interface{}
@@ -502,6 +501,16 @@ func processReferralCommission(db *gorm.DB, buyerUserID string, amount float64,
 			if share, ok := config["distributorShare"].(float64); ok {
 				distributorShare = share / 100
 			}
+			if disc, ok := config["userDiscount"].(float64); ok {
+				userDiscount = disc / 100
+			}
+		}
+	}
+	// 佣金按原价计算：若有推荐人则实付已打折，反推原价 = amount / (1 - userDiscount)
+	commissionBase := amount
+	if order != nil && userDiscount > 0 && (order.ReferrerID != nil && *order.ReferrerID != "" || order.ReferralCode != nil && *order.ReferralCode != "") {
+		if (1 - userDiscount) > 0 {
+			commissionBase = amount / (1 - userDiscount)
 		}
 	}
 
@@ -534,8 +543,8 @@ func processReferralCommission(db *gorm.DB, buyerUserID string, amount float64,
 		return
 	}
 
-	// 计算佣金
-	commission := amount * distributorShare
+	// 计算佣金（按原价）
+	commission := commissionBase * distributorShare
 	newPurchaseCount := binding.PurchaseCount + 1
 	newTotalCommission := binding.TotalCommission + commission