完善订单交接结账流程留痕

backend/internal/modules/order/dto.go

@@ -51,6 +51,8 @@ type OrderDTO struct {
 	GrowthPointsAwarded         int64             `json:"growth_points_awarded,omitempty"`
 	GrowthPointsAwardedAt       *time.Time        `json:"growth_points_awarded_at,omitempty"`
 	AccountSnapshot             datatypes.JSON    `json:"account_snapshot"`
+	AccountSource               string            `json:"account_source"`
+	SourceChannel               string            `json:"source_channel,omitempty"`
 	Status                      string            `json:"status"`
 	HandoffStatus               string            `json:"handoff_status"`
 	HandoffMode                 string            `json:"handoff_mode"`
@@ -190,6 +192,28 @@ type HandoffRecordDTO struct {
 	CreatedAt           time.Time  `json:"created_at"`
 }
 
+// ProcessEventDTO 是后台交易时间线中的一条不可变过程记录。
+type ProcessEventDTO struct {
+	ID             uint64         `json:"id"`
+	BusinessType   string         `json:"business_type"`
+	BusinessID     uint64         `json:"business_id"`
+	Stage          string         `json:"stage"`
+	Action         string         `json:"action"`
+	ActorType      string         `json:"actor_type"`
+	ActorID        uint64         `json:"actor_id"`
+	ActorName      string         `json:"actor_name"`
+	TargetType     string         `json:"target_type"`
+	TargetID       *uint64        `json:"target_id,omitempty"`
+	TargetName     string         `json:"target_name"`
+	Content        string         `json:"content"`
+	Reason         string         `json:"reason"`
+	Payload        datatypes.JSON `json:"payload"`
+	AttachmentURLs []string       `json:"attachment_urls"`
+	StateBefore    datatypes.JSON `json:"state_before"`
+	StateAfter     datatypes.JSON `json:"state_after"`
+	CreatedAt      time.Time      `json:"created_at"`
+}
+
 type CheckoutDTO struct {
 	ID                      uint64     `json:"id"`
 	OrderID                 uint64     `json:"order_id"`