feat: add Codex CLI and Claude Code CLI translation services

[zhuolingli]

Summary

• add Codex CLI and Claude Code CLI as optional translation services
• integrate with locally installed CLI tools without requiring provider API keys in Zotero
• support configurable model, prompt, executable, and timeout settings
• add English, Chinese, and Italian localization and setup documentation

Implementation

• send source text through stdin and read translated text from stdout
• invoke CLI processes directly without using a shell
• run Codex in an ephemeral read-only session
• run Claude Code with tools and session persistence disabled
• report missing executables, timeouts, non-zero exits, and empty output as translation errors

Validation

• npm run build
• Prettier
• ESLint
• git diff --check upstream/main...HEAD

[cislunarspace]

@zhuolingli 请问你是遇到什么问题，而想到需要添加这个功能？我认为仓库管理员不采纳这个PR的主要原因是缺少实际部署截图、性能分析和故事说明。