Add an API endpoint that provides an overview of the installed Composer packages and Laravel version for each site/application. The endpoint should allow retrieval of package and framework information for a single site as well as for all sites accessible to the authenticated user.
The response should include the site name or identifier, the current Laravel version, all installed Composer packages with their versions.
This functionality will make it easier to identify which Laravel version is running on each site, monitor package versions across multiple projects, detect outdated dependencies, and support maintenance and upgrade planning. The information can be gathered from Composer metadata (such as composer.lock) and may be cached to reduce performance impact.
