[BUG] 字段上@JSONField的JSONWriter.Feature.WriteNullBooleanAsFalse不生效

### 问题描述
fastjson2字段上注解JSONField(serializeFeatures = JSONWriter.Feature.WriteNullBooleanAsFalse)不生效。

### 环境信息
jdk21 , fastjson2.0.58

### 重现步骤

```java
@Data
public class TestDTO{
@JSONField(serializeFeatures = JSONWriter.Feature.WriteNullBooleanAsFalse)
private Boolean booleanField;
private String otherField="";
}

```
JSON.toJSONString(new TestDTO());

### 期待的正确结果
```json
{
"booleanField": false,
"otherField": ""
}
```

Start by reproducing the issue with the supplied TestDTO on JDK 21 and fastjson2 2.0.58, calling JSON.toJSONString(new TestDTO()). Trace how JSONField.serializeFeatures handles JSONWriter.Feature.WriteNullBooleanAsFalse. Done means the output includes booleanField as false and preserves otherField as an empty string.

Written by the indexing model from the issue text.