feat(wms): 添加材料卷厚度差计算功能

- 在WmsMaterialCoilAllExportVo中新增厚度差字段
- 在导出列配置中添加厚度差映射
- 实现厚度差计算逻辑：理论厚度减去实际厚度
- 添加数字格式异常处理避免程序崩溃
- 支持厚度差数据的Excel导出功能

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

@@ -3807,6 +3807,17 @@ public class WmsMaterialCoilServiceImpl implements IWmsMaterialCoilService {
                     String isRelatedText = vo.getIsRelatedToOrder() == 0 ? "否" : "是";
                     vo.setIsRelatedToOrderText(isRelatedText);
                 }
+
+                // 计算厚度差：理论厚度 - 实际厚度
+                if (vo.getTheoreticalThickness() != null && vo.getActualThickness() != null) {
+                    try {
+                        BigDecimal theory = new BigDecimal(vo.getTheoreticalThickness());
+                        BigDecimal actual = new BigDecimal(vo.getActualThickness());
+                        vo.setThicknessDifference(theory.subtract(actual).toString());
+                    } catch (NumberFormatException ignored) {
+                        // 解析失败则留空
+                    }
+                }
             }
         }