add doctor command

src/SPC/doctor/AsCheckItem.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\doctor;
+
+#[\Attribute(\Attribute::TARGET_METHOD)]
+class AsCheckItem
+{
+    public mixed $callback = null;
+
+    public function __construct(
+        public string $item_name,
+        public ?string $limit_os = null,
+        public int $level = 100
+    ) {
+    }
+}