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/dto.go

@@ -96,6 +96,8 @@ type UserOrderListItemDTO struct {
 	Title                   string     `json:"title"`
 	ServerRegion            string     `json:"server_region"`
 	LoginPlatform           string     `json:"login_platform"`
+	RentalDays              int        `json:"rental_days,omitempty"`
+	DailyLossM              float64    `json:"daily_loss_m,omitempty"`
 	DisplayAmountCent       int64      `json:"display_amount_cent"`
 	DepositAmountCent       int64      `json:"deposit_amount_cent"`
 	DepositWaivedAmountCent int64      `json:"deposit_waived_amount_cent"`

backend/internal/modules/order/presenter.go

@@ -179,6 +179,7 @@ func (row orderRow) toUserListItem(userID uint64, paymentDeadlineAt *time.Time)
 	if role == "owner" && row.OwnerRentAmountCent > 0 {
 		displayAmountCent = row.OwnerRentAmountCent
 	}
+	rentalDays, dailyLossM := orderListingTerms(row.AccountSnapshot)
 	return UserOrderListItemDTO{
 		ID:                      row.ID,
 		OrderNo:                 row.OrderNo,
@@ -188,6 +189,8 @@ func (row orderRow) toUserListItem(userID uint64, paymentDeadlineAt *time.Time)
 		Title:                   row.Title,
 		ServerRegion:            row.ServerRegion,
 		LoginPlatform:           row.LoginPlatform,
+		RentalDays:              rentalDays,
+		DailyLossM:              dailyLossM,
 		DisplayAmountCent:       displayAmountCent,
 		DepositAmountCent:       row.DepositAmountCent,
 		DepositWaivedAmountCent: row.DepositWaivedAmountCent,

backend/internal/modules/order/presenter_test.go

@@ -7,6 +7,8 @@ import (
 	"time"
 
 	"hfb_sys/backend/internal/model"
+
+	"gorm.io/datatypes"
 )
 
 func TestOrderDTOForUserHidesDepositHoldFields(t *testing.T) {
@@ -72,6 +74,44 @@ func TestUserOrderListItemDoesNotSerializeDetailFields(t *testing.T) {
 	}
 }
 
+func TestUserOrderListItemIncludesRentalTerms(t *testing.T) {
+	row := orderRow{
+		RentalOrder: model.RentalOrder{
+			AccountSnapshot: datatypes.JSON([]byte(`{"haf_coin_amount":100000000,"asset_summary":{"daily_loss_m":10}}`)),
+		},
+		Title: "微信 三角洲巅峰 100M哈夫币",
+	}
+
+	item := row.toUserListItem(20, nil)
+	if item.RentalDays != 10 {
+		t.Fatalf("rental days = %d, want 10", item.RentalDays)
+	}
+	if item.DailyLossM != 10 {
+		t.Fatalf("daily loss = %v, want 10", item.DailyLossM)
+	}
+
+	raw, err := json.Marshal(item)
+	if err != nil {
+		t.Fatalf("Marshal() error = %v", err)
+	}
+	text := string(raw)
+	if !strings.Contains(text, `"rental_days":10`) || !strings.Contains(text, `"daily_loss_m":10`) {
+		t.Fatalf("list response missing rental terms: %s", text)
+	}
+}
+
+func TestUserOrderListItemOmitsRentalTermsWithoutSnapshot(t *testing.T) {
+	item := orderRow{Title: "测试账号"}.toUserListItem(20, nil)
+	raw, err := json.Marshal(item)
+	if err != nil {
+		t.Fatalf("Marshal() error = %v", err)
+	}
+	text := string(raw)
+	if strings.Contains(text, "rental_days") || strings.Contains(text, "daily_loss_m") {
+		t.Fatalf("empty snapshot should omit rental terms: %s", text)
+	}
+}
+
 func TestAdminOrderListItemShowsPhonesAndOmitsSnapshot(t *testing.T) {
 	row := orderRow{
 		RentalOrder: model.RentalOrder{ID: 1, OrderNo: "ORD-001", Status: orderStatusPendingPayment},

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 {