docs: 重写 README（安装教程 + 12 张截图 + Demo 链接）

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- README：清空旧内容，新增安装教程（脚本/Docker/Releases/源码）、配置、开发、
  截图预览 12 张、在线 Demo https://artex-demo.vercel.app/
- screenshots/：12 张页面预览
- fix(mock)：activity/conversation 的 detail 端点返回真实内容（此前气泡显示占位文）

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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Autumn-27andClaude Opus 4.8 committed 2026-07-26 05:16:43 -04:00

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