feat(report): 添加请假和报餐统计报表功能

- 在IWmsLeaveRequestService接口中新增按请假类型、部门、月份统计的方法
- 在IWmsMealReportService接口中新增按餐别、部门、日期统计的方法
- 在WmsLeaveRequestController中添加请假统计报表相关API端点
- 在WmsMealReportController中添加报餐统计报表相关API端点
- 在WmsLeaveRequestServiceImpl中实现请假统计报表的数据查询逻辑
- 在WmsMealReportServiceImpl中实现报餐统计报表的数据查询逻辑
- 使用QueryWrapper构建统计查询条件，支持多维度筛选和分组统计
- 统一返回Map格式的统计数据，便于前端展示报表图表

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

@@ -18,6 +18,8 @@ import com.klp.service.IWmsLeaveRequestService;
 import java.util.List;
 import java.util.Map;
 import java.util.Collection;
+import java.util.Date;
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 
 /**
  * 员工请假申请Service业务层处理
@@ -115,4 +117,60 @@ public class WmsLeaveRequestServiceImpl implements IWmsLeaveRequestService {
         }
         return baseMapper.deleteBatchIds(ids) > 0;
     }
+
+    /**
+     * 请假统计报表 - 按请假类型统计
+     */
+    @Override
+    public List<Map<String, Object>> getLeaveTypeReport(WmsLeaveRequestBo bo) {
+        QueryWrapper<WmsLeaveRequest> qw = new QueryWrapper<>();
+        qw.select("leave_type as type",
+                  "COUNT(*) as count",
+                  "SUM(leave_days) as total_days")
+           .eq(bo.getApplicantDeptName() != null, "applicant_dept_name", bo.getApplicantDeptName())
+           .ge(bo.getStartTime() != null, "start_time", bo.getStartTime())
+           .le(bo.getEndTime() != null, "end_time", bo.getEndTime())
+           .eq("del_flag", 0)
+           .groupBy("leave_type")
+           .orderByDesc("total_days");
+        return baseMapper.selectMaps(qw);
+    }
+
+    /**
+     * 请假统计报表 - 按部门统计
+     */
+    @Override
+    public List<Map<String, Object>> getLeaveDeptReport(WmsLeaveRequestBo bo) {
+        QueryWrapper<WmsLeaveRequest> qw = new QueryWrapper<>();
+        qw.select("applicant_dept_name as dept_name",
+                  "COUNT(*) as count",
+                  "SUM(leave_days) as total_days")
+           .isNotNull("applicant_dept_name")
+           .eq(StringUtils.isNotBlank(bo.getLeaveType()), "leave_type", bo.getLeaveType())
+           .ge(bo.getStartTime() != null, "start_time", bo.getStartTime())
+           .le(bo.getEndTime() != null, "end_time", bo.getEndTime())
+           .eq("del_flag", 0)
+           .groupBy("applicant_dept_name")
+           .orderByDesc("total_days");
+        return baseMapper.selectMaps(qw);
+    }
+
+    /**
+     * 请假统计报表 - 按月份统计
+     */
+    @Override
+    public List<Map<String, Object>> getLeaveMonthlyReport(WmsLeaveRequestBo bo) {
+        QueryWrapper<WmsLeaveRequest> qw = new QueryWrapper<>();
+        qw.select("DATE_FORMAT(start_time, '%Y-%m') as month",
+                  "COUNT(*) as count",
+                  "SUM(leave_days) as total_days")
+           .ge(bo.getStartTime() != null, "start_time", bo.getStartTime())
+           .le(bo.getEndTime() != null, "end_time", bo.getEndTime())
+           .eq(StringUtils.isNotBlank(bo.getLeaveType()), "leave_type", bo.getLeaveType())
+           .eq(bo.getApplicantDeptName() != null, "applicant_dept_name", bo.getApplicantDeptName())
+           .eq("del_flag", 0)
+           .groupBy("month")
+           .orderByAsc("month");
+        return baseMapper.selectMaps(qw);
+    }
 }