发现懒加载属性不能赋值。

```swift
class MnlModel: HandyJSON {
lazy var advert = [[String: Any]]()
required init() {}
}
```

```swift
let dict = ["m_url": "http://m.meinali.com/ap_show-113.html",
"pid": 113,
"title": "俏佳人无痕美鼻免费案例征集——长沙雅美"]
if let model = MnlRecommendModel.deserialize(from: dict) {
print(model.advert)
// []
}
```

Start by running the MnlModel example with HandyJSON's deserialize(from:) entry point and confirm that the lazy advert property remains an empty array. Trace how deserialization discovers and assigns properties, then add a regression test showing the expected dictionary value is preserved for lazy properties.

Written by the indexing model from the issue text.