docs: 所有文档英文化——英文主版 + 中文版

[lwpk110]

变更概述

完成「国际化所有文档」：CONTRIBUTING / AGENTS / PRD 均提供英文主版，中文版保留为 *.zh-CN.md。

变更内容

• CONTRIBUTING.md / AGENTS.md / PRD.md → 英文主版
• 原中文版保留：CONTRIBUTING.zh-CN.md / AGENTS.zh-CN.md / PRD.zh-CN.md
• README 双版目录结构更新，标注双语文件

文档矩阵（全部双语）

文档	英文主版	中文版
README	README.md	README.zh-CN.md
CONTRIBUTING	CONTRIBUTING.md	CONTRIBUTING.zh-CN.md
AGENTS	AGENTS.md	AGENTS.zh-CN.md
PRD	PRD.md	PRD.zh-CN.md

验证

• 8 个文档 markdown 围栏全部配对

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⚙️ Run configuration

Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between d4de303 and 8293a60.

📒 Files selected for processing (8)

• AGENTS.md
• AGENTS.zh-CN.md
• CONTRIBUTING.md
• CONTRIBUTING.zh-CN.md
• PRD.md
• PRD.zh-CN.md
• README.md
• README.zh-CN.md

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