feat(api): 新增节点墙状态检测闭环

新增父节点墙状态检测任务、结果上报与节点列表状态装饰，
支持子节点继承父节点检测结果并通过 WS/REST 双链路执行

管理端补充墙状态筛选、搜索、单行与批量检测入口，
同时更新知识库归档并新增后续自动上线方案包

app/Models/ServerGfwCheck.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class ServerGfwCheck extends Model
+{
+    public const STATUS_PENDING = 'pending';
+    public const STATUS_CHECKING = 'checking';
+    public const STATUS_NORMAL = 'normal';
+    public const STATUS_BLOCKED = 'blocked';
+    public const STATUS_PARTIAL = 'partial';
+    public const STATUS_FAILED = 'failed';
+    public const STATUS_SKIPPED = 'skipped';
+
+    public const FINAL_STATUSES = [
+        self::STATUS_NORMAL,
+        self::STATUS_BLOCKED,
+        self::STATUS_PARTIAL,
+        self::STATUS_FAILED,
+        self::STATUS_SKIPPED,
+    ];
+
+    protected $table = 'server_gfw_checks';
+
+    protected $guarded = ['id'];
+
+    protected $casts = [
+        'summary' => 'array',
+        'operator_summary' => 'array',
+        'raw_result' => 'array',
+        'checked_at' => 'integer',
+    ];
+
+    public function server(): BelongsTo
+    {
+        return $this->belongsTo(Server::class, 'server_id', 'id');
+    }
+}