- Removed `system_key` from payment method model and related files.
- Updated payment method repository and services to eliminate references to `system_key`.
- Deleted the BootstrapSystemPaymentMethodsService and its use case, as they are no longer needed.
- Adjusted tests to reflect the removal of system payment methods and their associated logic.
- Added SQL script to drop the `system_key` column and its unique index from the database.
- Implemented `usePaymentMethodUpdateMutation` for updating payment methods with validation.
- Created settings controllers and hooks for managing payment methods.
- Added UI components for creating, editing, deleting, and displaying payment methods.
- Introduced error handling and feedback mechanisms for payment method operations.
- Developed form schemas and utility functions for handling payment method data.
- Established a new settings page for managing payment methods with appropriate loading and error states.
