chore: 发布 v8.0.1

- 版本号统一更新至 v8.0.1（README 中英 badge / about.txt / xcli_core/constants.py 中央 VERSION / TUI banner / LSP·MCP clientInfo.version）
- CHANGELOG 新增 v8.0.1 条目，记录 Operit 转译层落地与 5 个已验证市场插件接入

README.en.md

@@ -5,7 +5,7 @@
 </p>
 
 <p align="center">
-  <img src="https://img.shields.io/badge/version-5.4.1-blue" alt="version">
+  <img src="https://img.shields.io/badge/version-8.0.1-blue" alt="version">
   <img src="https://img.shields.io/badge/python-3.10+-green" alt="python">
   <img src="https://img.shields.io/badge/license-MIT-orange" alt="license">
   <img src="https://img.shields.io/badge/tests-113%20passed-brightgreen" alt="tests">