[BUG] JSONB not support input type TIMESTAMP_SECONDS

### 问题描述
*简要描述您碰到的问题。*
JSONB JSONB.parseObject not support input type TIMESTAMP_SECONDS

### 环境信息
*请填写以下信息：*

- JDK信息： [e.g.：Openjdk 1.8.0_312]
- 版本信息：[e.g.：Fastjson2 2.0.60]

### 重现步骤
*如何操作可以重现该问题：*
com.alibaba.fastjson2.JSONException: fieldName not support input type TIMESTAMP_SECONDS -84, offset 1
2025-10-27T12:31:55.458071287Z at com.alibaba.fastjson2.JSONReaderJSONB.readFieldNameHashCodeError(JSONReaderJSONB.java:1628) ~[fastjson2-2.0.60.jar!/:?]
2025-10-27T12:31:55.458074955Z at com.alibaba.fastjson2.JSONReaderJSONB.readFieldNameHashCode(JSONReaderJSONB.java:1530) ~[fastjson2-2.0.60.jar!/:?]
at com.alibaba.fastjson2.reader.ORG_4_18RequestParam.readJSONBObject(Unknown Source) ~[?:?]
2025-10-27T12:31:55.458092250Z at com.alibaba.fastjson2.JSONB.parseObject(JSONB.java:734) ~[fastjson2-2.0.60.jar!/:?]

//可在此输入示例代码
```
RequestParam request = JSONB.parseObject(record.value(), RequestParam.class);

Start at JSONB.parseObject and the JSONReaderJSONB.readFieldNameHashCode/readFieldNameHashCodeError locations named in the stack trace, using the RequestParam example to reproduce the TIMESTAMP_SECONDS failure. Done means the same JSONB input can be parsed without the unsupported-input-type exception.

Written by the indexing model from the issue text.