aiomcp-server-filesystem

Create a file management utility named 'FileNexus' that leverages the 'aiomcp-server-filesystem' Python package to provide a robust, asynchronous file system interface over a network. This utility will serve as both a local and remote file manager, allowing users to perform operations such as uploading, downloading, listing files, and deleting files from a server via a command-line interface (CLI).

The core functionality of 'FileNexus' includes:
1. User Authentication: Implement basic user authentication to ensure only authorized users can access the file system.
2. File Operations: Allow users to upload new files, download existing files, list all files in a directory, and delete files.
3. Directory Navigation: Enable users to navigate through directories on the server using commands similar to those found in a Unix shell.
4. Logging: Maintain logs of all file operations for auditing purposes.
5. Error Handling: Gracefully handle errors and exceptions that may occur during file operations, providing clear and informative messages to the user.

To achieve these functionalities, you will utilize the 'aiomcp-server-filesystem' package to set up the server-side file system management. Specifically, you will use the package to:
- Initialize a server instance that listens for incoming client connections.
- Define endpoints for each file operation (upload, download, list, delete).
- Handle asynchronous requests from clients using the capabilities provided by the package.
- Ensure thread-safe operations when dealing with file systems.

Your task is to design and implement the 'FileNexus' utility, ensuring it is well-documented and easy to extend for future enhancements.