修复(#79): 合并internal并适配数量配价

Co-authored-by: multica-agent <github@multica.ai>

apis/types.api

@@ -265,6 +265,12 @@ type (
 		PromoPrice  int64  `json:"promo_price"`
 		CreatedAt   int64  `json:"created_at"`
 	}
+	SubscribePromo {
+		RuleName   string `json:"rule_name"`
+		RuleType   string `json:"rule_type"`
+		PromoPrice int64  `json:"promo_price"`
+		ExpiresAt  int64  `json:"expires_at"`
+	}
 	TrafficLimit {
 		StatType     string `json:"stat_type"`
 		StatValue    int64  `json:"stat_value"`
@@ -279,6 +285,7 @@ type (
 		UnitPrice         int64               `json:"unit_price"`
 		UnitTime          string              `json:"unit_time"`
 		Discount          []SubscribeDiscount `json:"discount"`
+		Promo             *SubscribePromo     `json:"promo"`
 		NodeCount         int64               `json:"node_count"`
 		Replacement       int64               `json:"replacement"`
 		Inventory         int64               `json:"inventory"`
@@ -743,6 +750,7 @@ type (
 		Price          int64  `json:"price"`
 		Amount         int64  `json:"amount"`
 		Discount       int64  `json:"discount"`
+		PromoDiscount  int64  `json:"promo_discount"`
 		GiftAmount     int64  `json:"gift_amount"`
 		Coupon         string `json:"coupon"`
 		CouponDiscount int64  `json:"coupon_discount"`