docs: 统一双语 README 头部格式与版本线说明（目录换行、JDK 版本线修正、锚点修复）

Author: loong10k

README.md

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 # codex-java-sdk
 
-[![Java](https://img.shields.io/badge/Java-8-orange)] [![License](https://img.shields.io/badge/license-Apache%202.0-green)](https://www.apache.org/licenses/LICENSE-2.0.txt)
+[English](./README.md) | [简体中文](./README.zh-CN.md)
+
+[![License](https://img.shields.io/badge/license-Apache%202.0-green)
 
 > Java SDK for the [Codex CLI](https://github.com/openai/codex): subprocess
 > integration that drives the local `codex` agent (exec, interactive sessions,

README.zh-CN.md

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 # codex-java-sdk
 
-[![Java](https://img.shields.io/badge/Java-8-orange)] [![License](https://img.shields.io/badge/license-Apache%202.0-green)](https://www.apache.org/licenses/LICENSE-2.0.txt)
+[English](./README.md) | [简体中文](./README.zh-CN.md)
+
+[![License](https://img.shields.io/badge/license-Apache%202.0-green)
 
 > [Codex CLI](https://github.com/openai/codex) 的 Java SDK：通过子进程集成驱动本地
 > `codex` 智能体（exec 非交互执行、交互会话、会话 resume / fork / archive、
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 - [10. 版本与分支](#10-版本与分支)
 - [11. 贡献与许可](#11-贡献与许可)
 
-[English](./README.md) | [简体中文](./README.zh-CN.md)
-
 ## 1. 项目概述
 
 `codex-java-sdk` 让 Java 应用把 [Codex CLI](https://github.com/openai/codex) 智能体