feat(user): 会员卡片支持查看该会员参与的项目和任务

- 新增权限闸门 UserDepartment::userWorksContext（本人/管理员/部门负责人只读，排除机器人与系统账号）
- 新增接口 project/user/projects、project/user/tasks、project/user/counts
- users/extra 返回 works_visible 标记控制入口显隐
- 会员卡片新增「项目与任务」入口，弹出 UserWorksModal（项目/待办/已完成三 Tab、角标计数、工作流状态徽章、懒加载）
- 部门只读视角下任务仅展示全员可见(visibility=1)，与 findForDepartmentView 对齐
- 补充 i18n 文案与暗色样式

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Http/Controllers/Api/UsersController.php

@@ -884,7 +884,8 @@ class UsersController extends AbstractController
      */
     public function extra()
     {
-        $user = User::auth();
+        $viewer = User::auth();
+        $user = $viewer;
         //
         $userid = intval(Request::input('userid'));
         if ($userid <= 0) {
@@ -919,6 +920,8 @@ class UsersController extends AbstractController
 
         $tagMeta = UserTag::listWithMeta($userid, $user);
 
+        $worksContext = UserDepartment::userWorksContext($viewer, $userid);
+
         $data = [
             'userid' => $userid,
             'birthday' => $birthday,
@@ -926,6 +929,7 @@ class UsersController extends AbstractController
             'introduction' => $introduction,
             'personal_tags' => $tagMeta['top'],
             'personal_tags_total' => $tagMeta['total'],
+            'works_visible' => $worksContext['allowed'],
         ];
 
         return Base::retSuccess('success', $data);