- Added `data_download_list` field to `ComponentConfig` struct in `component.rs`.
- Implemented processing of `data_download_list` in the `PackageManager` to download files asynchronously in `facade.rs`.
- Updated `installer.rs` to initialize `data_download_list` for various components.
- Refactored `download_file` function in `utils.rs` to return `anyhow::Error` for better error handling.
Implement core package manager with component configuration, installer
logic, OS detection, and a command‑line interface for install, remove,
list, and status operations.
