fix(wms/material): 修正钢卷长度字段为整型

将WmsMaterialCoil及相关BO/VO中的length和actualLength字段从BigDecimal改为Long类型，并在WmsCoilPendingActionServiceImpl和WmsCoilWarehouseOperationLogServiceImpl中相应调整赋值逻辑，确保类型转换时进行空值检查，避免空指针异常。

klp-wms/src/main/java/com/klp/domain/WmsMaterialCoil.java

@@ -137,7 +137,7 @@ public class WmsMaterialCoil extends BaseEntity {
 
 
     //新增长度字段
-    private BigDecimal length;
+    private Long length;
 
     //发货人
     private String exportBy;
@@ -167,7 +167,7 @@ public class WmsMaterialCoil extends BaseEntity {
     /**
      * 实测长度
      */
-    private BigDecimal actualLength;
+    private Long actualLength;
 
     /**
      * 实测宽度

klp-wms/src/main/java/com/klp/domain/bo/WmsMaterialCoilBo.java

@@ -238,7 +238,7 @@ public class WmsMaterialCoilBo extends BaseEntity {
 
 
     //新增长度字段
-    private BigDecimal length;
+    private Long length;
 
     // 新增的在钢卷表中的表面处理
     private String coilSurfaceTreatment;
@@ -295,7 +295,7 @@ public class WmsMaterialCoilBo extends BaseEntity {
     /**
      * 实测长度
      */
-    private BigDecimal actualLength;
+    private Long actualLength;
 
     /**
      * 实测宽度

klp-wms/src/main/java/com/klp/domain/vo/WmsMaterialCoilAllExportVo.java

@@ -130,7 +130,7 @@ public class WmsMaterialCoilAllExportVo {
 
 
     @ExcelProperty(value = "长度")
-    private BigDecimal length;
+    private Long length;
 
     /**
      * 规格

klp-wms/src/main/java/com/klp/domain/vo/WmsMaterialCoilExportVo.java

@@ -125,7 +125,7 @@ public class WmsMaterialCoilExportVo {
 
 
     @ExcelProperty(value = "长度")
-    private BigDecimal length;
+    private Long length;
 
     /**
      * 实测厚度

klp-wms/src/main/java/com/klp/domain/vo/WmsMaterialCoilVo.java

@@ -236,7 +236,7 @@ public class WmsMaterialCoilVo extends BaseEntity {
     private String saleName;
 
     //新增长度字段
-    private BigDecimal length;
+    private Long length;
 
     //发货人
     private String exportBy;
@@ -277,7 +277,7 @@ public class WmsMaterialCoilVo extends BaseEntity {
      * 实测长度
      */
     @ExcelProperty(value = "实测长度")
-    private BigDecimal actualLength;
+    private Long actualLength;
 
     /**
      * 实测宽度

klp-wms/src/main/java/com/klp/service/impl/WmsCoilPendingActionServiceImpl.java

@@ -303,7 +303,7 @@ public class WmsCoilPendingActionServiceImpl implements IWmsCoilPendingActionSer
                     // 净重 > 毛重
                     plan.setInMatWeight(coil.getNetWeight() != null ? coil.getNetWeight() : coil.getGrossWeight());
                     // 长度
-                    plan.setInMatLength(coil.getLength());
+                    plan.setInMatLength(coil.getLength() != null ? BigDecimal.valueOf(coil.getLength()) : null);
 
                     // ② 查原材料库（itemType='raw_material' 时通过 itemId 关联）
                     if ("raw_material".equals(coil.getItemType()) && coil.getItemId() != null) {

klp-wms/src/main/java/com/klp/service/impl/WmsCoilWarehouseOperationLogServiceImpl.java

@@ -18,6 +18,7 @@ import org.springframework.stereotype.Service;
 import com.klp.domain.bo.WmsCoilWarehouseOperationLogBo;
 import com.klp.domain.vo.WmsCoilWarehouseOperationLogVo;
 import com.klp.domain.vo.WmsCoilWarehouseOperationLogExportVo;
+import java.math.BigDecimal;
 import com.klp.domain.vo.WmsMaterialCoilVo;
 import com.klp.domain.WmsCoilWarehouseOperationLog;
 import com.klp.mapper.WmsCoilWarehouseOperationLogMapper;
@@ -295,7 +296,7 @@ public class WmsCoilWarehouseOperationLogServiceImpl implements IWmsCoilWarehous
                 exportVo.setStatusDesc(getStatusDesc(coil.getStatus()));
                 exportVo.setItemName(coil.getItemName());
                 exportVo.setSpecification(coil.getSpecification());
-                exportVo.setLength(coil.getLength());
+                exportVo.setLength(coil.getLength() != null ? BigDecimal.valueOf(coil.getLength()) : null);
                 exportVo.setMaterial(coil.getMaterial());
                 exportVo.setManufacturer(coil.getManufacturer());
                 exportVo.setSurfaceTreatmentDesc(coil.getSurfaceTreatmentDesc());