[Request]: Add an open API to support GUIs, VS Code extensions, and DevContainers

### Feature or enhancement request details

### What is the problem?
Right now, `apple/container` only works in the terminal. Because it does not have a shared management layer or an open API, we cannot use popular developer tools.

We are missing out on:
* **GUIs / Dashboards:** There is no visual screen or app to see and manage running containers.
* **VS Code Extensions:** Popular plugins (like the Docker extension) cannot connect to it.
* **DevContainers:** It is very hard to use this for automated, multi-container development workspaces.

### What is the solution?
Please add an open local API or a background control plane.

If you give developers a way to connect to the runtime, the community can easily build third-party tools, visual apps, and IDE extensions to support this project.

### Alternatives considered
* Using only the terminal command line for everything, which is difficult for complex workflows.

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

Start with the existing terminal command-line interface and runtime boundary, then define the local API or background control plane needed by GUIs, VS Code extensions, and DevContainers. Done means providing a usable connection point for those integrations; the issue names no files, tests, or specific API design to begin from.

Written by the indexing model from the issue text.