docs(readme): add Pilion Browser cross-link

[echoVic]

摘要

• 在 README.md（中文）与 README.en.md（英文）各新增一节「🌐 在浏览器里使用 Blade / Use Blade in a browser」，指向 Pilion Browser。
• 这是与 Pilion 侧的互链：Pilion 已把 Blade 加为一等 ACP 预置（Agent 面板选 Blade → 启动 blade --acp）。本 PR 补上反向链接，和 orca-agent README 里已合并的「Use Orca from Pilion Browser」小节对称。

文案依据

内容取自 Pilion 的预置定义：blade --acp 启动、按需安装 blade-code（Node.js ≥ 22.19.0）、转发 DeepSeek/Anthropic/OpenAI/Gemini/xAI/OpenRouter 等 Key、标签页作为 MCP 工具（snapshot/screenshot/navigate/click/type），操作前审批 + 人工接管。

改动范围

• 纯文档，+12 行，无代码/依赖变更。
• 位置在「文档」与「贡献」之间。

Test plan

• README.md 与 README.en.md 渲染正常，新小节标题与链接可点击
• Pilion releases 链接与仓库链接指向正确

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• README.en.md
• README.md

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