feat(listings): 订单和账号详情展示可租时长与每日消耗

租客在订单列表和详情标题能看到每个号的租期、消耗。账号详情把这两项拆成独立格子。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/modules/order/pricing.go

@@ -124,6 +124,20 @@ func orderEstimatedEndAt(order model.RentalOrder) *time.Time {
 	return &endAt
 }
 
+// orderListingTerms 用下单快照里的哈夫币和日损耗估算租期，和首页「可租 / 消耗」同一口径。
+func orderListingTerms(snapshot datatypes.JSON) (days int, dailyLossM float64) {
+	dailyLossM = readOrderSnapshotAssetNumber(snapshot, "daily_loss_m")
+	coinM := readOrderSnapshotCoinM(snapshot)
+	if dailyLossM <= 0 || coinM <= 0 {
+		return 0, 0
+	}
+	days = int(math.Ceil(coinM / dailyLossM))
+	if days < 1 {
+		days = 1
+	}
+	return days, roundQuantity(dailyLossM)
+}
+
 func estimateOrderDurationHours(snapshot datatypes.JSON) int {
 	hafCoinM := readOrderSnapshotCoinM(snapshot)
 	if hafCoinM <= 0 {