Restructure payment settings into a separate tab for better organization and user experience. The changes include:
1. Create dedicated Payment components in the Setting directory structure
2. Move payment-related settings from SystemSetting to PaymentSetting
3. Add proper i18n support with useTranslation hook
4. Split payment settings into GeneralPayment and PaymentGateway components
5. Fix internationalization issues in placeholder text
6. Update navigation with CreditCard icon for payment tab
This refactoring improves code maintainability by following the established project pattern of having specialized setting components in their own directories.
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