feat(wms): 添加第二个表格统计功能

- 在 IWmsRawMaterialService 中新增 queryStatistics 方法用于统计原材料数据
- 在 WmsRawMaterialController 中添加 /statistics 接口端点
- 在 WmsRawMaterialMapper 中新增 selectStatistics 查询方法
- 在 XML 映射文件中实现统计查询的 SQL 语句
- 在服务实现类中完成统计逻辑，按厂家、材质、规格分组计算钢卷件数和重量
- 新增 ManufacturerStatisticsVo、MaterialStatisticsVo、SpecificationStatisticsVo 和 WmsRawMaterialStatisticsVo 数据传输对象
- 实现多层级数据聚合统计功能，包括厂家、材质、规格维度的数据汇总

klp-wms/src/main/java/com/klp/domain/vo/dashboard/ManufacturerStatisticsVo.java

@@ -0,0 +1,13 @@
+package com.klp.domain.vo.dashboard;
+
+import lombok.Data;
+import java.math.BigDecimal;
+import java.util.List;
+
+@Data
+public class ManufacturerStatisticsVo {
+    private String manufacturer;
+    private Integer totalCoilCount;
+    private BigDecimal totalWeight;
+    private List<MaterialStatisticsVo> materials;
+}

klp-wms/src/main/java/com/klp/domain/vo/dashboard/MaterialStatisticsVo.java

@@ -0,0 +1,13 @@
+package com.klp.domain.vo.dashboard;
+
+import lombok.Data;
+import java.math.BigDecimal;
+import java.util.List;
+
+@Data
+public class MaterialStatisticsVo {
+    private String material;
+    private Integer totalCoilCount;
+    private BigDecimal totalWeight;
+    private List<SpecificationStatisticsVo> specifications;
+}

klp-wms/src/main/java/com/klp/domain/vo/dashboard/SpecificationStatisticsVo.java

@@ -0,0 +1,11 @@
+package com.klp.domain.vo.dashboard;
+
+import lombok.Data;
+import java.math.BigDecimal;
+
+@Data
+public class SpecificationStatisticsVo {
+    private String specification;
+    private Integer coilCount;
+    private BigDecimal totalWeight;
+}

klp-wms/src/main/java/com/klp/domain/vo/dashboard/WmsRawMaterialStatisticsVo.java

@@ -0,0 +1,18 @@
+package com.klp.domain.vo.dashboard;
+
+import lombok.Data;
+import java.math.BigDecimal;
+
+@Data
+public class WmsRawMaterialStatisticsVo {
+
+    private String manufacturer;
+
+    private String material;
+
+    private String specification;
+
+    private Integer coilCount;
+
+    private BigDecimal totalWeight;
+}