fix: validate transfer rejection and align dispatch HTTP contracts

lastleg-service/src/main/java/com/baiyue/lastleg/transfer/dto/WarehouseTransferRequests.java

@@ -52,6 +52,7 @@ public final class WarehouseTransferRequests {
         }
     }
 
+    /** 审核通过备注选填；驳回必须提供非空原因，由服务在任何状态写入前校验。 */
     public record Review(@NotBlank @Size(max = 32) String decision,
                          @Size(max = 1000) String remark) {}
 

lastleg-service/src/main/java/com/baiyue/lastleg/transfer/service/WarehouseTransferService.java

@@ -358,6 +358,9 @@ public class WarehouseTransferService {
             case "REJECT", REJECTED -> REJECTED;
             default -> throw badRequest("Review decision must be APPROVE or REJECT");
         };
+        if (REJECTED.equals(next) && !StringUtils.hasText(request.remark())) {
+            throw badRequest("驳回原因不能为空");
+        }
         WarehouseTransferOrder transfer = transfers.lockNo(customerId, transferNo);
         if (transfer == null) throw notFound("Warehouse transfer order not found");
         if (!PENDING_REVIEW.equals(transfer.getStatus())) {
@@ -384,7 +387,8 @@ public class WarehouseTransferService {
         order.setUpdatedAt(now); orders.updateById(order);
         if (!java.util.Objects.equals(before, orderStatus)) {
             insertOrderHistory(customerId, order.getId(), before, orderStatus, transferNo,
-                "Warehouse transfer reviewed: " + next, now);
+                "Warehouse transfer reviewed: " + next
+                    + (StringUtils.hasText(request.remark()) ? "; " + request.remark().trim() : ""), now);
         }
         return detail(customerId, transferNo);
     }