Migrate Frontend HTTP Requests to AJAX in Ultimate POS

[KagemaNjoroge]

Currently, the Ultimate POS frontend relies on traditional HTTP requests for handling data retrieval and manipulation. To improve performance and enhance user experience, we should migrate these requests to AJAX.

Tasks:

• [x] Identify all HTTP requests in the frontend codebase.
• [x] Replace HTTP requests with AJAX calls using appropriate libraries (e.g., jQuery.ajax or Fetch API).
• [x] Test each AJAX call thoroughly to ensure functionality is maintained.
• [x] Update documentation to reflect changes made.

Additional Context: AJAX (Asynchronous JavaScript and XML) allows for asynchronous communication between the browser and the server, enabling smoother and faster data retrieval and updates without requiring full page reloads. This migration will align Ultimate POS with modern web development standards and improve overall performance.

[KagemaNjoroge]

All http requests migrated to AJAX