v0.4.1

English

• Added complete English and Simplified Chinese interfaces for the manager, agent chooser,
  command-line help, confirmations, status messages, and backend errors.
• The display language now follows the system locale and can be overridden with
  AGENT_SESSION_CLEANER_LANG=en or AGENT_SESSION_CLEANER_LANG=zh-CN.
• English is now the default README language, with a complete Chinese edition linked from it.
  Release notes include English first and Chinese second.
• Build checks and release automation now run against the English interface and use English logs.

中文

• 主界面、来源选择、命令行帮助、确认框、状态提示和后端错误现已完整支持英文与
  简体中文。
• 显示语言会跟随系统 locale，也可以通过 AGENT_SESSION_CLEANER_LANG=en 或
  AGENT_SESSION_CLEANER_LANG=zh-CN 强制指定。
• README 默认显示英文，并链接到完整中文版；发布日志先显示英文，再显示中文。
• 构建检查和发布自动化现改为验证英文界面，并统一使用英文日志。