feat(bpm): 新增排除工作组部门的用户部门名查询接口

- 新增 getNotWorkGroupDepartNamesByUsername，过滤 depart_type='4' 的工作组
- SQL 改为只查 depart_name，不再返回 SysDepart 实体，消除无效字段查询和循环转换
- 已有 getDepartNamesByUsername 同步优化为 name-only 查询
- ActTaskController 节点查询切换至新接口，排除工作组部门

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

jeecg-boot-platform/jeecg-boot-module-bpm-flowable/src/main/java/org/jeecg/modules/bpm/controller/ActTaskController.java

@@ -563,7 +563,7 @@ public class ActTaskController {
 						taskInfo.put("assignee", assignee);
 						LoginUser user = sysBaseAPI.getUserByName(assignee);
 						taskInfo.put("assigneeName", user != null ? user.getRealname() : assignee);
-						List<String> deptNames = sysBaseAPI.getDepartNamesByUsername(assignee);
+						List<String> deptNames = sysBaseAPI.getNotWorkGroupDepartNamesByUsername(assignee);
 						taskInfo.put("deptNames", deptNames != null ? deptNames : Collections.emptyList());
 					} else {
 						taskInfo.put("assignee", "");