feat(admin-frontend): 新增节点自动上线托管能力

为节点新增 auto_online 字段与后台同步任务，
仅对开启托管的节点按在线状态自动同步前台显示。

管理端补齐单节点与批量开关、列表标识与统计，
并在自动上线启用时禁用手动显隐切换。

后端新增定时命令、保存校验、批量更新支持、
数据库迁移与单元测试，保证托管逻辑可落地。

app/Console/Commands/SyncServerAutoOnline.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Services\ServerAutoOnlineService;
+use Illuminate\Console\Command;
+
+class SyncServerAutoOnline extends Command
+{
+    protected $signature = 'sync:server-auto-online';
+
+    protected $description = 'Sync visible status for nodes with auto online enabled';
+
+    public function handle(ServerAutoOnlineService $service): int
+    {
+        $result = $service->sync();
+
+        $this->info(sprintf(
+            'Server auto online synced: total=%d updated=%d shown=%d hidden=%d unchanged=%d',
+            $result['total'],
+            $result['updated'],
+            $result['shown'],
+            $result['hidden'],
+            $result['unchanged']
+        ));
+
+        return self::SUCCESS;
+    }
+}

app/Console/Kernel.php

@@ -44,6 +44,7 @@ class Kernel extends ConsoleKernel
         $schedule->command('horizon:snapshot')->everyFiveMinutes()->onOneServer();
         // cleanup stale online_count (GC for Redis TTL expiration)
         $schedule->command('cleanup:online-status')->everyFiveMinutes()->onOneServer();
+        $schedule->command('sync:server-auto-online')->everyFiveMinutes()->onOneServer()->withoutOverlapping(5);
         // backup Timing
         // if (env('ENABLE_AUTO_BACKUP_AND_UPDATE', false)) {
         //     $schedule->command('backup:database', ['true'])->daily()->onOneServer();