docs: 统一补全 README 头部徽章（Java 按分支版本 + Apache 2.0 License）

Author: loong10k

README.md

@@ -2,7 +2,7 @@
 
 [English](./README.md) | [简体中文](./README.zh-CN.md)
 
-[![License](https://img.shields.io/badge/license-Apache%202.0-green)
+[![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)
 
 > 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

@@ -2,7 +2,7 @@
 
 [English](./README.md) | [简体中文](./README.zh-CN.md)
 
-[![License](https://img.shields.io/badge/license-Apache%202.0-green)
+[![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)
 
 > [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、