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) {}