feat: 扩展 SeekDB 支持联系人、项目、任务的 AI 搜索

- 合并 SeekDBFileSyncTask 到 SeekDBSyncTask
- 统一 AI 搜索 API 入口

app/Observers/ProjectTaskVisibilityUserObserver.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\ProjectTaskVisibilityUser;
+use App\Tasks\SeekDBSyncTask;
+
+/**
+ * ProjectTaskVisibilityUser 观察者
+ *
+ * 用于处理任务 visibility=3（指定成员可见）时的成员变更同步
+ */
+class ProjectTaskVisibilityUserObserver extends AbstractObserver
+{
+    /**
+     * Handle the ProjectTaskVisibilityUser "created" event.
+     *
+     * @param  \App\Models\ProjectTaskVisibilityUser  $visibilityUser
+     * @return void
+     */
+    public function created(ProjectTaskVisibilityUser $visibilityUser)
+    {
+        // 将指定成员添加到 SeekDB 的 task_users 表
+        self::taskDeliver(new SeekDBSyncTask('task_user_add', [
+            'task_id' => $visibilityUser->task_id,
+            'userid' => $visibilityUser->userid,
+        ]));
+    }
+
+    /**
+     * Handle the ProjectTaskVisibilityUser "updated" event.
+     *
+     * @param  \App\Models\ProjectTaskVisibilityUser  $visibilityUser
+     * @return void
+     */
+    public function updated(ProjectTaskVisibilityUser $visibilityUser)
+    {
+        // 通常不会更新，但如果更新了也同步
+        self::taskDeliver(new SeekDBSyncTask('task_user_add', [
+            'task_id' => $visibilityUser->task_id,
+            'userid' => $visibilityUser->userid,
+        ]));
+    }
+
+    /**
+     * Handle the ProjectTaskVisibilityUser "deleted" event.
+     *
+     * @param  \App\Models\ProjectTaskVisibilityUser  $visibilityUser
+     * @return void
+     */
+    public function deleted(ProjectTaskVisibilityUser $visibilityUser)
+    {
+        // 从 SeekDB 的 task_users 表删除该成员
+        // 注意：需要检查该用户是否仍是任务的负责人/协作人
+        // 如果是，则不应该删除（因为 ProjectTaskUser 仍存在）
+        self::taskDeliver(new SeekDBSyncTask('task_visibility_user_remove', [
+            'task_id' => $visibilityUser->task_id,
+            'userid' => $visibilityUser->userid,
+        ]));
+    }
+
+    /**
+     * Handle the ProjectTaskVisibilityUser "restored" event.
+     *
+     * @param  \App\Models\ProjectTaskVisibilityUser  $visibilityUser
+     * @return void
+     */
+    public function restored(ProjectTaskVisibilityUser $visibilityUser)
+    {
+        //
+    }
+
+    /**
+     * Handle the ProjectTaskVisibilityUser "force deleted" event.
+     *
+     * @param  \App\Models\ProjectTaskVisibilityUser  $visibilityUser
+     * @return void
+     */
+    public function forceDeleted(ProjectTaskVisibilityUser $visibilityUser)
+    {
+        //
+    }
+}
+