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/ProjectTaskUserObserver.php

@@ -5,8 +5,9 @@ namespace App\Observers;
 use App\Models\Deleted;
 use App\Models\ProjectTaskUser;
 use App\Models\ProjectUser;
+use App\Tasks\SeekDBSyncTask;
 
-class ProjectTaskUserObserver
+class ProjectTaskUserObserver extends AbstractObserver
 {
     /**
      * Handle the ProjectTaskUser "created" event.
@@ -20,6 +21,19 @@ class ProjectTaskUserObserver
         if ($projectTaskUser->task_pid) {
             Deleted::forget('projectTask', $projectTaskUser->task_pid, $projectTaskUser->userid);
         }
+
+        // 同步任务成员到 SeekDB
+        self::taskDeliver(new SeekDBSyncTask('task_user_add', [
+            'task_id' => $projectTaskUser->task_id,
+            'userid' => $projectTaskUser->userid,
+        ]));
+        // 如果是子任务，同时添加到父任务
+        if ($projectTaskUser->task_pid) {
+            self::taskDeliver(new SeekDBSyncTask('task_user_add', [
+                'task_id' => $projectTaskUser->task_pid,
+                'userid' => $projectTaskUser->userid,
+            ]));
+        }
     }
 
     /**
@@ -44,6 +58,12 @@ class ProjectTaskUserObserver
         if (!ProjectUser::whereProjectId($projectTaskUser->project_id)->whereUserid($projectTaskUser->userid)->exists()) {
             Deleted::record('projectTask', $projectTaskUser->task_id, $projectTaskUser->userid);
         }
+
+        // 从 SeekDB 删除任务成员关系
+        self::taskDeliver(new SeekDBSyncTask('task_user_remove', [
+            'task_id' => $projectTaskUser->task_id,
+            'userid' => $projectTaskUser->userid,
+        ]));
     }
 
     /**