cache Command for Local Source Management

Currently, The module source code to a local directory (e.g., `/usr/irissys/ipm/`). While this acts as a local repository, there is no native way to manage these files within the ZPM shell. Users must manually delete folders.

### **The Proposal**

Introduce a `cache` command modeled after the existing `history` command pattern. This command will allow users to clean and prune the physical files stored in the IPM installation directory.

### **Feature Breakdown**

1. **`cache clean []`**: Deletes the folder in `/ipm/` and clears the internal metadata (`list -ss` entry).
2. **`cache prune`**: Identifies folders on disk that do not match an active installation in any namespace and deletes them.