新增查询绑定结果接口（自建发货页轮询角色信息）

- GET /api/client/v1/orders/{order_no}/delivery/bind-result?bind_uuid=xxx
- 返回 bound/game_account/role_name/game_channel；未绑定返回 bound=false（不报错，供轮询）
- 对接文档自建发货页模式新增该接口，注明轮询建议间隔

backend/internal/handler/open_v1.go

@@ -227,6 +227,22 @@ func (h *OpenV1Handler) BindDeliveryOrder(c *gin.Context) {
 	response.OK(c, result)
 }
 
+// GetDeliveryBindResult GET /api/client/v1/orders/:order_no/delivery/bind-result
+// 查询绑定结果与角色信息（自建发货页轮询绑定状态用）。
+func (h *OpenV1Handler) GetDeliveryBindResult(c *gin.Context) {
+	openlog.SetAction(c, openlog.ActionQuery)
+	orderNo := c.Param("order_no")
+	bindUUID := c.Query("bind_uuid")
+	openlog.Info(c, "delivery_bind_result start order_no=%s bind_uuid=%s", orderNo, bindUUID)
+	result, err := h.deliverySvc.GetBindResult(middleware.GetMerchantID(c), orderNo, bindUUID)
+	if err != nil {
+		openlog.Warn(c, "delivery_bind_result fail order_no=%s err=%v", orderNo, err)
+		response.BadRequest(c, err.Error())
+		return
+	}
+	response.OK(c, result)
+}
+
 type openDeliverySubmitReq struct {
 	GameAccount string `json:"game_account" binding:"required"`
 	BindUUID    string `json:"bind_uuid" binding:"required"`