Update payment method creation page on platform

🔍 Problem Statement

The Payment Method Creation page uses an old UI/UX that no longer meets current design standards. It should be updated using new Preline templates to improve usability, consistency, and overall user experience.

💡 User Story

As an admin, I want a modern and intuitive payment method creation experience so that I can add payment details easily and confidently.

🎯 Definition of Done (DoD)

A feature is done when:

1. Updated Payment Method Creation UI is implemented using Preline templates.

2. Validation should fail on UI first and then from backend.

3. UI is reviewed and approved by design/product stakeholders.

4. Responsive behavior is verified across supported screen sizes.

5. Form validation and error handling are implemented and tested.

6. Accessibility basics are covered, including labels, keyboard navigation, and readable contrast.

7. Existing payment method creation functionality continues to work as expected.