完善退款审批材料与恢复流程

internal/handler/admin/refund.go

@@ -83,6 +83,20 @@ func (h *RefundHandler) TriggerApproval(c *fiber.Ctx) error {
 	return response.Success(c, result)
 }
 
+// RecoverApproval 恢复退款最新审批实例的原提交事实。
+// POST /api/admin/refunds/:id/recover-approval
+func (h *RefundHandler) RecoverApproval(c *fiber.Ctx) error {
+	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
+	if err != nil || id == 0 {
+		return errors.New(errors.CodeInvalidParam, "无效的退款申请ID")
+	}
+	result, err := h.service.RecoverApproval(c.UserContext(), uint(id))
+	if err != nil {
+		return err
+	}
+	return response.Success(c, result)
+}
+
 // Approve 审批通过退款申请
 // POST /api/admin/refunds/:id/approve
 func (h *RefundHandler) Approve(c *fiber.Ctx) error {