IA-627/ feat: redesign payment configuration with modern architecture

• Add modular payment configuration system with separate views

• Implement Stripe, Credit Card, and Bank Transfer configurations

• Replace Material-UI icons with FontAwesome for consistency

• Create reusable components (ConfigurationCard, PaymentConfigLayout)

• Implement form validation with react-hook-form and zod

• Add real-time preview for client-facing payment methods

• Include comprehensive TypeScript types and custom hooks

• Support multi-currency bank accounts with IBAN/SWIFT validation

• Add status indicators and configuration management

Closes IA-627