[BUG] [SupportSmartMatch] 使用JSON.to或者JSONObject.getObject JSONObject.getObject时；全小写的字段名不生效

### 问题描述
使用JSON.to或者JSONObject.getObject JSONObject.getObject时；全小写的字段名不生效
涉及api:
com.alibaba.fastjson2.JSONObject#getObject(java.lang.String, java.lang.Class, com.alibaba.fastjson2.JSONReader.Feature...)
com.alibaba.fastjson2.JSON#to

### 环境信息
- OS信息： Win11
- JDK信息： 1.8
- 版本信息：Fastjson2 2.0.53

### 重现步骤

```java
import java.util.Map;

import org.assertj.core.api.Assertions;
import org.junit.Before;
import org.junit.Test;

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONObject;
import com.alibaba.fastjson2.JSONReader;

import lombok.Data;

public class ObjToBeanFeatureTest {

@Before
public void setUp() throws Exception {
JSON.config(JSONReader.Feature.SupportSmartMatch, false);
}

@Test
public void allLowerCaseFieldObjToBean() {
// 全小写 有问题
String text = "{\"appid\":\"com.xxx.xxx\"}";

// 全局设置智能匹配， 反序列化没问题
JSON.config(JSONReader.Feature.SupportSmartMatch, true);
Bean bean2 = JSON.parseObject(text, Bean.class);
Assertions.assertThat(bean2.appID).isEqualTo("com.xxx.xxx");

Map jsonObject = JSON.parseObject(text);
Assertions.assertThat(jsonObject.get("appid")).isEqualTo("com.xxx.xxx");
JSONObject obj = new JSONObject();
obj.put("v1", jsonObject);

// 传 Feature，两个API均无法正确反序列化
Bean bean3 = obj.getObject("v1", Bean.class, JSONReader.Feature.SupportSmartMatch);
Assertions.assertThat(bean3.appID).isEqualTo(null);
Bean bean4 = JSON.to(Bean.class, jsonObject);
Assertions.assertThat(bean4.appID).isEqualTo(null);
}

@Data
private static class Bean {
private String appID;
}

}
```

### 期待的正确结果
期望与反序列化API的处理方式保持一致

Start with the ObjToBeanFeatureTest reproducer and inspect the JSON.to and JSONObject#getObject entry points, comparing their handling with JSON.parseObject when SupportSmartMatch is enabled. The fix is complete when the all-lowercase "appid" field populates Bean.appID consistently and the reproducer assertions pass.

Written by the indexing model from the issue text.