修正订单群聊与发布跳转

backend/internal/modules/chat/conversation.go

@@ -87,8 +87,34 @@ func (r *Repository) FindConversation(ctx context.Context, principal Principal,
 	return &dto, nil
 }
 func (r *Repository) FindOrderConversation(ctx context.Context, userID uint64, orderID uint64) (*ConversationDTO, error) {
-	var row conversationRow
 	principal := Principal{Type: "user", ID: userID}
+	var order model.RentalOrder
+	if err := r.db.WithContext(ctx).First(&order, orderID).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, ErrConversationNotFound
+		}
+		return nil, err
+	}
+
+	if order.ListingID > 0 {
+		var row conversationRow
+		err := r.conversationQuery(ctx, principal).
+			Where("c.listing_id = ? AND c.type = ?", order.ListingID, ConversationTypeListingGroup).
+			First(&row).Error
+		if err == nil {
+			participants, err := r.participants(ctx, row.ID)
+			if err != nil {
+				return nil, err
+			}
+			dto := row.toDTO(participants)
+			return &dto, nil
+		}
+		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, err
+		}
+	}
+
+	var row conversationRow
 	err := r.conversationQuery(ctx, principal).Where("c.order_id = ?", orderID).First(&row).Error
 	if err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {