feat(HrmFlowCcController): 增加抄送状态查询功能

```
- 在my方法中新增readFlag参数，支持按读取状态过滤抄送记录
- 使用LoginHelper替代StpUtil获取用户ID，提高代码一致性
- 将readFlag参数传递给业务对象，实现按状态查询功能
```

klp-hrm/src/main/java/com/klp/hrm/controller/HrmFlowCcController.java

@@ -27,17 +27,18 @@ public class HrmFlowCcController extends BaseController {
      * 抄送我的
      */
     @GetMapping("/my")
-    public TableDataInfo<HrmFlowCcVo> my(@RequestParam(required = false) Long ccUserId, PageQuery pageQuery) {
+    public TableDataInfo<HrmFlowCcVo> my(@RequestParam(required = false) Long ccUserId,@RequestParam(required = false) Integer readFlag, PageQuery pageQuery) {
         Long uid = ccUserId;
         if (uid == null) {
             try {
-                uid = StpUtil.getLoginIdAsLong();
+                uid = LoginHelper.getUserId();
             } catch (Exception e) {
                 uid = null;
             }
         }
         HrmFlowCcBo bo = new HrmFlowCcBo();
         bo.setCcUserId(uid);
+        bo.setReadFlag(readFlag);
         return service.queryPageList(bo, pageQuery);
     }