test(aot): 添加对象属性toArray方法测试用例

- 测试toArray()方法调度功能
- 验证(array)强制转换调用toArray()而不是读取属性表
- 添加User类包含toArray方法的测试
- 添加PlainUser类无toArray方法的对照测试
- 验证有toArray方法时强制转换调用该方法
- 验证无toArray方法时回退到属性表读取

tests/aot/object_property/toarray-method.phpt

@@ -0,0 +1,55 @@
+--TEST--
+toArray() method dispatch: (array) cast calls toArray() instead of reading property table
+--FILE--
+<?php
+
+class User {
+    public int $id;
+    public string $name;
+
+    public function __construct(int $id, string $name) {
+        $this->id = $id;
+        $this->name = $name;
+    }
+
+    public function toArray(): array {
+        return [
+            'uid' => $this->id,
+            'display_name' => $this->name,
+            'source' => 'toArray',
+        ];
+    }
+}
+
+class PlainUser {
+    public int $id;
+    public string $name;
+
+    public function __construct(int $id, string $name) {
+        $this->id = $id;
+        $this->name = $name;
+    }
+}
+
+function main() {
+    $user = new User(1, 'admin');
+    // (array) cast should call User::toArray(), not read properties
+    $arr = (array) $user;
+    var_dump($arr['uid']);
+    var_dump($arr['display_name']);
+    var_dump($arr['source']);
+
+    // no toArray() method — falls back to property table
+    $plain = new PlainUser(2, 'guest');
+    $arr2 = (array) $plain;
+    var_dump($arr2['id']);
+    var_dump($arr2['name']);
+}
+
+?>
+--EXPECT--
+int(1)
+string(5) "admin"
+string(7) "toArray"
+int(2)
+string(5) "guest"