[BUG]JSONPath.contains和JSONPath.eval输出结果不一致

### 问题描述
JSONPath.contains结果为false，但JSONPath.eval可以取到值

### 环境信息
- OS信息： NA
- JDK信息：Openjdk 21.0.8
- 版本信息：Fastjson2 2.0.60

### 重现步骤
private void test1() {
String s = """
{"status": 200}
""";

boolean contains = JSONPath.contains(s, "$.status");
Object eval = JSONPath.eval(s, "$.status");
System.out.println(eval); // 返回 200
System.out.println(contains); // 返回 false 期望返回 true
}

Start by running the provided Java reproduction against Fastjson2 2.0.60, then inspect JSONPath.contains and JSONPath.eval for how they process $.status. Add a regression test covering the shown JSON and path, and confirm that both methods consistently report the existing value.

Written by the indexing model from the issue text.