feat(crm): 添加订单项统计功能

- 在CrmOrderItemController中新增三个统计接口：按订单ID、销售员、合同ID统计配卷汇总
- 实现resolveCoilIdsByOrderId、resolveCoilIdsBySalesman、resolveCoilIdsByContractId辅助方法
- 重构queryCoilsByOrderId、queryCoilsBySalesman、queryCoilsByContractIdPaginated方法逻辑
- 新增queryCoilsByOrderIdStatistics、queryCoilsBySalesmanStatistics、queryCoilsByContractIdStatistics统计方法
- 添加emptyStatistics私有方法返回默认统计值
- 在WmsDeliveryWaybillDetailController中新增按负责人统计已发货钢卷汇总接口

klp-crm/src/main/java/com/klp/crm/controller/CrmOrderItemController.java

@@ -148,4 +148,24 @@ public class CrmOrderItemController extends BaseController {
                                                                             PageQuery pageQuery) {
         return iCrmOrderItemService.queryCoilsByContractIdPaginated(contractId, pageQuery);
     }
+
+    // 根据订单ID统计配卷汇总
+    @GetMapping("/coils/order/{orderId}/statistics")
+    public R<java.util.Map<String, java.math.BigDecimal>> getCoilsByOrderIdStatistics(@NotNull(message = "订单ID不能为空")
+                                                                                        @PathVariable Long orderId) {
+        return R.ok(iCrmOrderItemService.queryCoilsByOrderIdStatistics(orderId));
+    }
+
+    // 根据销售员统计生产成果汇总
+    @GetMapping("/coils/bySalesman/statistics")
+    public R<java.util.Map<String, java.math.BigDecimal>> getCoilsBySalesmanStatistics(@RequestParam String salesman) {
+        return R.ok(iCrmOrderItemService.queryCoilsBySalesmanStatistics(salesman));
+    }
+
+    // 根据合同ID统计生产成果汇总
+    @GetMapping("/coils/byContract/{contractId}/statistics")
+    public R<java.util.Map<String, java.math.BigDecimal>> getCoilsByContractIdStatistics(@NotNull(message = "合同ID不能为空")
+                                                                                           @PathVariable Long contractId) {
+        return R.ok(iCrmOrderItemService.queryCoilsByContractIdStatistics(contractId));
+    }
 }