refactor platform logic and add gasorder domain

backend/api/internal/models/gasorder_track_point.go

@@ -0,0 +1,21 @@
+package models
+
+import (
+	"time"
+
+	"git.apinb.com/bsm-sdk/core/database"
+)
+
+// GasorderTrackPoint 对应 gasorder_track_point，保存不可变配送位置点。
+type GasorderTrackPoint struct {
+	Entity                    // 公共实体字段
+	GasorderTrackID uint64    `gorm:"column:gasorder_track_id;not null;index" json:"gasorder_track_id"`      // 轨迹自增主键
+	Longitude       string    `gorm:"column:longitude;type:varchar(32);not null" json:"longitude"`           // 经度
+	Latitude        string    `gorm:"column:latitude;type:varchar(32);not null" json:"latitude"`             // 纬度
+	OccurredAt      time.Time `gorm:"column:occurred_at;type:timestamptz;not null;index" json:"occurred_at"` // 定位发生时间
+	Source          string    `gorm:"column:source;type:varchar(32);not null;default:'gps'" json:"source"`   // 定位来源
+	Accuracy        string    `gorm:"column:accuracy;type:varchar(32);not null;default:''" json:"accuracy"`  // 定位精度
+}
+
+func init()                                         { database.AppendMigrate(&GasorderTrackPoint{}) }
+func (table *GasorderTrackPoint) TableName() string { return "gasorder_track_point" }