feat: 完善平台总后台模块

backend/api/internal/models/delivery_track.go

@@ -0,0 +1,17 @@
+package models
+
+import (
+	"git.apinb.com/bsm-sdk/core/database"
+	"time"
+)
+
+// DeliveryTrack 对应 delivery_track，保存配送轨迹摘要。
+type DeliveryTrack struct {
+	Entity
+	DeliveryTaskID uint64     `gorm:"column:delivery_task_id;not null;index" json:"delivery_task_id"`
+	StartedAt      *time.Time `gorm:"column:started_at;type:timestamptz" json:"started_at"`
+	CompletedAt    *time.Time `gorm:"column:completed_at;type:timestamptz" json:"completed_at"`
+}
+
+func init()                                    { database.AppendMigrate(&DeliveryTrack{}) }
+func (table *DeliveryTrack) TableName() string { return "delivery_track" }