fix dashboard empty data and split dev scripts

backend/api/internal/logic/platform/dashboard/statistics.go

@@ -71,7 +71,12 @@ var productStatusNames = map[int]string{
 
 // GetDashboardOverview 汇总组织、人员、资产、订单、支付及客服维度的数据。
 func GetDashboardOverview() (DashboardStatistics, error) {
-	var result DashboardStatistics
+	result := DashboardStatistics{
+		OrderStatuses:   make([]MetricSlice, 0),
+		ProductStatuses: make([]MetricSlice, 0),
+		PaymentChannels: make([]MetricSlice, 0),
+		RecentOrders:    make([]DailyMetric, 0),
+	}
 	counts := []struct {
 		model any
 		where string