Clear and concise description of the problem

In the document we mention on @oxc-project/runtime which provides the shims for js bundling.
However, new comer(like I was) cannot understand if @oxc-project/runtime is missing in the result of bundling.
(I know tsdown outputs warning like @oxc-project/runtime is missing but at first I couldn't understand it).

Suggested solution

It is like @antfu/eslint-config, it is good if tsdown suggest to install packages while building.

And, also it is good if tsdown suggests to install publint and unplugin-unused.

In addition, it is really good if we have some option like --auto-deps-install to install the libs above automatically

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.