feat: 设备入库时，返回重复的设备序列号

src/main/java/vion/service/impl/IDeviceServiceImpl.java

@@ -85,6 +85,17 @@ public class IDeviceServiceImpl extends MPJBaseServiceImpl<DeviceMapper, Device>
             return "该操作仅支持设备入库";
         }
         var userId = dtoList.getFirst().getUserId();
+
+        // 检查设备序列号是否已存在
+        var existDevice = this.lambdaQuery()
+                .in(Device::getSerialNum, dtoList.stream().map(DeviceDTO::getSerialNum).toList())
+                .list();
+        if (CollUtil.isNotEmpty(existDevice)) {
+            return existDevice.stream()
+                    .map(Device::getSerialNum)
+                    .collect(Collectors.joining(",", "设备序列号已存在：", ""));
+        }
+
         var deviceList = converter.convert(dtoList, Device.class);
         if (this.saveBatch(deviceList)) {
             var logList = deviceList.stream()