[Feature] 希望支持类似VS Code中将多个不同路径文件夹打开在一个工作区的功能

[wlmyyds]

Affected area

Desktop UI (agent-gui / React)

Problem statement (what should this solve)

希望增加一个类似VS Code将多个不同路径文件夹打开在一个工作区的功能，因为多个不同项目可能会在不同的文件夹下，能在一个工作区中添加多个项目打开会非常方便引用上下文文件

Proposed behavior

Estimated change scope

No response

Alternatives considered

No response

Pre-submit checklist

• I searched existing issues and pull requests and found no duplicates.
• This proposal is focused on a single feature or improvement.
• I understand a PR should come after this issue is confirmed by maintainers, otherwise it will be converted to draft.