The commit refactors the server-side modules of the Roxy-WI web interface to use JSON-based APIs for improved data exchange. Specifically, methods for user, group and SSH management have been updated to accept and return JSON data. Simultaneously, error handling is improved to give more informative responses instead of plain strings. The client-side JavaScript code is also refactored to accommodate these changes. Additionally, some minor corrections are made in the UI templates.
This commit simplifies the SSH key handling functionality in the server module. Unnecessary definitions and methods for checking and handling different key types have been removed. Now, paramiko's standard load_private_key method is directly used to load the SSH keys, which has streamlined the code and made it more maintainable.
