feat(manage): 实现部门负责人视角，支持只读查看部门成员项目与任务

部门负责人/部门管理员可通过系统配置开启，选择管理部门后只读查看
本部门及下级部门成员的全部项目和任务。前端自动根据 department_readonly
标记禁用编辑操作，后端统一注入负责人视角上下文控制数据访问边界。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Http/Controllers/Api/UsersController.php

@@ -404,9 +404,22 @@ class UsersController extends AbstractController
         $data['nickname_original'] = $user->getRawOriginal('nickname');
         $data['department_name'] = $user->getDepartmentName();
         $data['department_owner'] = UserDepartment::where('parent_id',0)->where('owner_userid', $user->userid)->exists(); // 适用默认部门下第1级负责人才能添加部门OKR
+        $data['managed_departments'] = UserDepartment::getManagedDepartments($user->userid)->toArray();
         return Base::retSuccess('success', $data);
     }
 
+    /**
+     * @api {get} api/users/info/managed_departments 获取我可切换负责人视角的部门列表
+     */
+    public function info__managed_departments()
+    {
+        $user = User::auth();
+        if (Base::settingFind('system', 'department_owner_project_view', 'close') !== 'open') {
+            return Base::retSuccess('success', []);
+        }
+        return Base::retSuccess('success', UserDepartment::getManagedDepartments($user->userid));
+    }
+
     /**
      * @api {get} api/users/info/departments 获取我的部门列表
      *
@@ -3272,7 +3285,7 @@ class UsersController extends AbstractController
             return Base::retError('参数错误');
         }
         //
-        ProjectTask::userTask($task_id, null, null);
+        ProjectTask::findForDepartmentView($task_id, null, null);
         //
         UserTaskBrowse::recordBrowse($user->userid, $task_id);
         //