feat(finance): add daily paid order count

backend/internal/modules/adminfinance/dashboard.go

@@ -222,6 +222,10 @@ func (r *Repository) dailyItems(ctx context.Context, query DashboardQuery) ([]Fi
 		Scan(&payments).Error; err != nil {
 		return nil, err
 	}
+	paidOrders, err := r.dailyPaidOrders(ctx, query)
+	if err != nil {
+		return nil, err
+	}
 
 	settlements := make([]dailySettlementRow, 0)
 	if err := db.Table("rental_orders AS ro").
@@ -307,6 +311,13 @@ func (r *Repository) dailyItems(ctx context.Context, query DashboardQuery) ([]Fi
 		item.PendingRefundCount = row.PendingRefundCount
 		itemsByDate[date] = item
 	}
+	for _, row := range paidOrders {
+		date := dailyDateKey(row.Date)
+		item := itemsByDate[date]
+		item.Date = date
+		item.PaidOrderCount = row.PaidOrderCount
+		itemsByDate[date] = item
+	}
 	for _, row := range settlements {
 		date := dailyDateKey(row.Date)
 		item := itemsByDate[date]
@@ -361,6 +372,19 @@ func (r *Repository) dailyItems(ctx context.Context, query DashboardQuery) ([]Fi
 	return items, nil
 }
 
+// dailyPaidOrders 仅统计普通租赁订单的成功支付，按实际支付完成时间归集。
+func (r *Repository) dailyPaidOrders(ctx context.Context, query DashboardQuery) ([]dailyPaidOrderRow, error) {
+	items := make([]dailyPaidOrderRow, 0)
+	err := r.db.WithContext(ctx).Table("payment_orders AS po").
+		Select(`DATE(po.paid_at) AS date,
+			COUNT(DISTINCT po.order_id) AS paid_order_count`).
+		Where("po.biz_type = ? AND po.status = ?", "order_pay", "paid").
+		Where("po.paid_at >= ? AND po.paid_at <= ?", query.StartDate, query.EndDate).
+		Group("DATE(po.paid_at)").
+		Scan(&items).Error
+	return items, err
+}
+
 type paymentSummaryRow struct {
 	TotalFlowAmountCent     int64
 	TotalRefundAmountCent   int64
@@ -398,6 +422,11 @@ type dailyPaymentRow struct {
 	PendingRefundCount      int64
 }
 
+type dailyPaidOrderRow struct {
+	Date           string
+	PaidOrderCount int64
+}
+
 type dailySettlementRow struct {
 	Date                               string
 	PlatformIncomeAmountCent           int64

backend/internal/modules/adminfinance/dashboard_test.go

@@ -0,0 +1,65 @@
+package adminfinance
+
+import (
+	"testing"
+	"time"
+
+	"hfb_sys/backend/internal/timeutil"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func TestDailyPaidOrdersUsePaidAtAndExcludeMohong(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
+	if err != nil {
+		t.Fatalf("打开测试数据库失败: %v", err)
+	}
+	if err := db.Exec(`CREATE TABLE payment_orders (
+		id INTEGER PRIMARY KEY,
+		order_id INTEGER NOT NULL,
+		biz_type TEXT NOT NULL,
+		status TEXT NOT NULL,
+		paid_at DATETIME NULL
+	)`).Error; err != nil {
+		t.Fatalf("创建支付单表失败: %v", err)
+	}
+
+	loc := timeutil.ShanghaiLocation()
+	day := func(value int) time.Time { return time.Date(2026, 8, value, 10, 0, 0, 0, loc) }
+	rows := [][]any{
+		{1, 101, "order_pay", "paid", day(2)},
+		{2, 101, "order_pay", "paid", day(2)},
+		{3, 102, "order_pay", "paid", day(3)},
+		{4, 201, "mohong_pay", "paid", day(2)},
+		{5, 103, "order_pay", "created", nil},
+		{6, 104, "order_pay", "paid", day(1)},
+	}
+	for _, row := range rows {
+		if err := db.Exec(`INSERT INTO payment_orders (id, order_id, biz_type, status, paid_at)
+			VALUES (?, ?, ?, ?, ?)`, row...).Error; err != nil {
+			t.Fatalf("写入支付单失败: %v", err)
+		}
+	}
+
+	repo := NewRepository(db)
+	query := DashboardQuery{
+		StartDate: time.Date(2026, 8, 2, 0, 0, 0, 0, loc),
+		EndDate:   time.Date(2026, 8, 3, 23, 59, 59, 0, loc),
+	}
+	result, err := repo.dailyPaidOrders(t.Context(), query)
+	if err != nil {
+		t.Fatalf("读取每日已付款订单失败: %v", err)
+	}
+	if len(result) != 2 {
+		t.Fatalf("每日已付款记录数 = %d, want 2", len(result))
+	}
+	counts := make(map[string]int64, len(result))
+	for _, row := range result {
+		counts[row.Date] = row.PaidOrderCount
+	}
+	if counts["2026-08-02"] != 1 || counts["2026-08-03"] != 1 {
+		t.Fatalf("每日已付款订单 = %#v, want 8月2日和8月3日均为1", counts)
+	}
+}

backend/internal/modules/adminfinance/dto.go

@@ -216,6 +216,7 @@ type FinanceDailyDTO struct {
 	SettledOrderCount                  int64  `json:"settled_order_count"`
 	PickupCompletedCount               int64  `json:"pickup_completed_count"`
 	SalesCount                         int64  `json:"sales_count"`
+	PaidOrderCount                     int64  `json:"paid_order_count"`
 	OfflineSettlementPendingCount      int64  `json:"offline_settlement_pending_count"`
 	OfflineSettlementPaidAmountCent    int64  `json:"offline_settlement_paid_amount_cent"`
 	OfflineSettlementPaidCount         int64  `json:"offline_settlement_paid_count"`