AIPM CLI cli-v0.3.1

Enhance admin package management and CLI functionality

- Added support for listing and deleting admin packages through new API endpoints.
- Implemented a function to list admin packages with filtering options.
- Updated the registry client to include private packages in search results when authorized.
- Introduced a new integration test suite for admin package management, covering listing, deletion, and access control for private packages.
- Enhanced CSS styles for better layout and presentation of popular skills and documentation pages.