- Introduced `DomainHttpException` to standardize HTTP error responses with explicit domain error codes.
- Refactored `UnifiedExceptionFilter` to extract detailed exception information, including optional explicit error codes.
- Updated `WhmcsErrorHandlerService` to utilize `DomainHttpException` for better error normalization and handling.
- Removed deprecated error pattern matching logic to enforce explicit error codes in the system.
- Enhanced logging in `WhmcsHttpClientService` to differentiate between expected business outcomes and actual errors.
- Replaced multiple global exception filters with a unified exception filter to streamline error handling across the application.
- Removed deprecated AuthErrorFilter and GlobalExceptionFilter to reduce redundancy.
- Enhanced SupportController to include new endpoints for listing, retrieving, and creating support cases, improving the support case management functionality.
- Integrated SalesforceCaseService for better interaction with Salesforce data in support case operations.
- Updated support case schemas to align with new requirements and ensure data consistency.
