feat: DSH 对话导入，且绝不替用户启动 dsh

[starsstreaming]

改了什么

main 已经不附带、不启动 DSH。这次在这条路上补上对话导入，并写清楚用户必须自己 dsh web。

• 插件注册 /bg、/bg-theme、/bg-clear 和 beauticode_* 工具
• 托盘在跑时复用托盘控制面（dsh-control.json），避免两套写入抢锁
• 没有托盘时，在已经运行的 DSH 进程里走同一套 DshSession
• 安装包会打进 agent.mjs / control-client.mjs / host-apply.mjs
• README 去掉「安装包内置 DSH 运行时」的过期说法

不会做什么

• 不启动、不安装、不打包 DeepSeek Harness
• 不改 Codex 启动路径
• 不改媒体契约和已有主题数据

怎么验证

1. 自己运行 dsh web（需已加载 beautiCode 插件）
2. 打开 beautiCode，选 DeepSeek Harness：只连已开网页，DSH 没跑会提示先启动
3. 托盘导入图片/MP4 仍可用
4. 在 DSH 里 /bg <绝对路径> 或让 AI 设背景

@beauticode/adapter-dsh 测试 28 个全过。

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