feat: node traffic limit & batch operations

- Traffic monitoring with transfer_enable limit
- Batch delete nodes
- Reset traffic (single/batch)

app/Models/Server.php

@@ -52,6 +52,10 @@ use Illuminate\Database\Eloquent\Casts\Attribute;
  * @property int|null $d 下行流量
  * @property int|null $total 总流量
  * @property-read array|null $load_status 负载状态（包含CPU、内存、交换区、磁盘信息）
+ * 
+ * @property int $transfer_enable 流量上限，0或者null表示不限制
+ * @property int $u 当前上传流量
+ * @property int $d 当前下载流量
  */
 class Server extends Model
 {
@@ -124,6 +128,9 @@ class Server extends Model
         'updated_at' => 'timestamp',
         'rate_time_ranges' => 'array',
         'rate_time_enable' => 'boolean',
+        'transfer_enable' => 'integer',
+        'u' => 'integer',
+        'd' => 'integer',
     ];
 
     private const MULTIPLEX_CONFIGURATION = [