docs(chat): 补充从聊天记录下载资源的分流策略（按链接 host 三层，closes #375）#376
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mono 与 multi 两份 chat.md 同步新增「从聊天记录下载资源」一节，按链接 host 分三类： - down.dingtalk.com/media：公开 CDN 直链，与文件类型无关（实测 png/jpg/gif/pdf/docx/xlsx/html 均 HTTP 200），优先 curl；扩展名 .unknown 时按 octet-stream 下载后用 file 判类型 - 钉盘文件 fileId：临时签名链接，走 dws drive download --node <fileId> - alidocs.dingtalk.com/i/nodes：文档/视频节点，裸 curl 仅得 HTML 预览页，走 dws doc / dws drive 示例全部脱敏占位符，明确 media 直链下载属 curl 禁令的例外。 Closes #375
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What
为
references/products/chat.md（mono 与 multi 两份同步）补充一节「从聊天记录下载资源（图片/GIF/文件/视频/文档）」，放在message list翻页说明之后、message list-all之前。Why
dws chat message list能拉到带资源的消息，但 skill 文档只讲了「发图片」，没讲拿到链接后如何下载/展示资源。详见 #375。核心结论：下载方式由链接 host 决定，不由文件类型决定
content里的链接形态down.dingtalk.com/media/...（任意类型）[文件] xxx fileId: <fileId>dws drive download --node <fileId>alidocs.dingtalk.com/i/nodes/<nodeId>dws doc/dws drive download（裸 curl 仅得 HTML 预览页）实测证据（覆盖图片与非图片）
dws 无 media 下载命令（
dws schema | grep media为空），media 直链只能 HTTP GET。Closes #375