feat(wms): 添加钢卷物料统计数据接口

- 在 IWmsMaterialCoilService 中新增 getStatistics 方法用于汇总统计
- 在 WmsMaterialCoilController 中添加 /statisticsList 接口
- 在 WmsMaterialCoilMapper 中新增 selectStatistics 查询方法
- 在 WmsMaterialCoilMapper.xml 中实现统计 SQL 查询
- 在 WmsMaterialCoilServiceImpl 中实现统计业务逻辑
- 支持按筛选条件统计总毛重、总净重和总数
- 采用高性能查询方式只查询 sum/count 聚合数据
- 独立统计接口不影响原有分页查询功能

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

@@ -342,6 +342,16 @@ public class WmsMaterialCoilServiceImpl implements IWmsMaterialCoilService {
         return TableDataInfo.build(bindResult);
     }
 
+    /**
+     * 统计筛选条件下的全量汇总数据（高性能：只查sum/count）
+     * 独立的统计接口，不影响分页查询
+     */
+    @Override
+    public Map<String, BigDecimal> getStatistics(WmsMaterialCoilBo bo) {
+        QueryWrapper<WmsMaterialCoil> qw = buildQueryWrapperPlus(bo);
+        return selectMaterialCoilStatistics(qw);
+    }
+
     private Page<WmsMaterialCoilVo> queryMaterialCoilPage(WmsMaterialCoilBo bo, PageQuery pageQuery) {
         QueryWrapper<WmsMaterialCoil> qw = buildQueryWrapperPlus(bo);
         Page<WmsMaterialCoilVo> result;
@@ -380,6 +390,30 @@ public class WmsMaterialCoilServiceImpl implements IWmsMaterialCoilService {
         }
     }
 
+    /**
+     * 统计筛选条件下的全量汇总数据（高性能：只查sum/count）
+     */
+    private Map<String, BigDecimal> selectMaterialCoilStatistics(QueryWrapper<WmsMaterialCoil> qw) {
+        Map<String, BigDecimal> result = new HashMap<>();
+        result.put("total_gross_weight", BigDecimal.ZERO);
+        result.put("total_net_weight", BigDecimal.ZERO);
+        result.put("total_count", BigDecimal.ZERO);
+
+        try {
+            Map<String, Object> stats = baseMapper.selectStatistics(qw);
+            if (stats != null) {
+                Object grossWeight = stats.get("total_gross_weight");
+                Object netWeight = stats.get("total_net_weight");
+                result.put("total_gross_weight", grossWeight != null ? new BigDecimal(grossWeight.toString()) : BigDecimal.ZERO);
+                result.put("total_net_weight", netWeight != null ? new BigDecimal(netWeight.toString()) : BigDecimal.ZERO);
+            }
+        } catch (Exception e) {
+            log.warn("统计查询失败: {}", e.getMessage());
+        }
+
+        return result;
+    }
+
     private void fillBindInfoForPage(List<WmsMaterialCoilBindVo> records) {
         // 绑定信息仅用于专用接口，避免污染通用分页结构
         try {