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把 DeepSeek Harness 变成手机 App：移动端界面重排（两级页面栈、会话列表主屏、composer 重排、手势、附件上传）+ 配对码认证网关 + PWA 安装 + 真 Web Push。Complete mobile plugin for DeepSeek Harness (DSH): app-shell mobile UI, pairing-code gateway for public-internet access behind your own reverse proxy, ins