fix: 修复权限级联同步缺口

修复 Manticore 搜索索引在特定场景下 allowed_users 权限未能正确同步的问题：

  Observer.updated 补充：
  - ProjectUserObserver: 处理项目成员移交时的权限级联
  - ProjectTaskUserObserver: 处理任务成员移交时的权限更新

  批量操作绕过 Observer 修复（delete → remove）：
  - FileUser: deleteFileAll/deleteFileUser 方法
  - ProjectTask: 可见性设置时的批量删除
  - ProjectController: 子任务升级和任务复制时的批量删除

  文件批量更新封装：
  - File 新增 updateChildFilesUserid() 方法，统一处理子文件 userid
    更新及 Manticore 同步

app/Http/Controllers/Api/ProjectController.php

@@ -2379,7 +2379,7 @@ class ProjectController extends AbstractController
             $task->save();
             ProjectTaskUser::whereTaskId($task->id)->update(['task_pid' => $task->id]);
             if ($task->visibility == 3 && !empty($visibilityUserids)) {
-                ProjectTaskVisibilityUser::whereTaskId($task->id)->delete();
+                ProjectTaskVisibilityUser::whereTaskId($task->id)->remove();
                 foreach (array_unique($visibilityUserids) as $userid) {
                     if (!$userid) {
                         continue;
@@ -3031,7 +3031,7 @@ class ProjectController extends AbstractController
                 $taskTag->project_id = $project->id;
                 $taskTag->save();
             }
-            ProjectTaskUser::whereTaskId($copy->id)->delete();
+            ProjectTaskUser::whereTaskId($copy->id)->remove();
             $copy->setRelation('taskUser', collect());
             $copy->setRelation('project', $project);
             $updateData = [