refactor platform logic and add gasorder domain

backend/api/internal/models/gasorder_confirm.go

@@ -0,0 +1,22 @@
+package models
+
+import (
+	"time"
+
+	"git.apinb.com/bsm-sdk/core/database"
+)
+
+// GasorderConfirm 对应 gasorder_confirm，保存用户签收确认。
+type GasorderConfirm struct {
+	Entity                    // 公共实体字段
+	GasorderBasicID uint64    `gorm:"column:gasorder_basic_id;not null;uniqueIndex" json:"gasorder_basic_id"`             // 订单自增主键
+	ConfirmType     string    `gorm:"column:confirm_type;type:varchar(32);not null" json:"confirm_type"`                  // 签收类型
+	RecipientName   string    `gorm:"column:recipient_name;type:varchar(64);not null" json:"recipient_name"`              // 签收人姓名快照
+	RecipientPhone  string    `gorm:"column:recipient_phone;type:varchar(32);not null;default:''" json:"recipient_phone"` // 签收人手机号快照
+	ProofURI        string    `gorm:"column:proof_uri;type:varchar(512);not null;default:''" json:"proof_uri"`            // 签名或凭证地址
+	ConfirmedAt     time.Time `gorm:"column:confirmed_at;type:timestamptz;not null;index" json:"confirmed_at"`            // 确认时间
+	Remark          string    `gorm:"column:remark;type:text;not null;default:''" json:"remark"`                          // 签收备注
+}
+
+func init()                                      { database.AppendMigrate(&GasorderConfirm{}) }
+func (table *GasorderConfirm) TableName() string { return "gasorder_confirm" }