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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 # security-jwt-extension
 
-![Java](https://img.shields.io/badge/Java-8-orange) ![License](https://img.shields.io/badge/License-Apache%202.0-blue)
+[English](./README.md) | [简体中文](./README.zh-CN.md)
 
 JWT authentication and authorization utilities for Spring Security. This module extends the Spring Security authentication model with JWT-aware tokens and filters, for both the servlet (Web) and reactive (WebFlux) stacks.
 

README.zh-CN.md

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 [English](./README.md) | [简体中文](./README.zh-CN.md)
 
-![Java](https://img.shields.io/badge/Java-8-orange) ![License](https://img.shields.io/badge/License-Apache%202.0-blue)
-
 面向 Spring Security 的 JWT 认证与授权工具。本模块为 Spring Security 认证模型补充 JWT 感知的 Token 与过滤器，同时覆盖 Servlet（Web）与响应式（WebFlux）技术栈。
 
 ## 目录