- Updated CREDIT_COSTS constants to Phase 0 format with new operations
- Enhanced CreditService with get_credit_cost() method and operation_type support
- Created AccountModuleSettings model for module enable/disable functionality
- Added AccountModuleSettingsSerializer and ViewSet
- Registered module settings API endpoint: /api/v1/system/settings/account-modules/
- Maintained backward compatibility with existing credit system
- Introduced a new public health check endpoint at `api/ping/` to verify API responsiveness.
- Refactored integration response handling to utilize a unified success and error response format across various methods in `IntegrationSettingsViewSet`, improving consistency and clarity in API responses.
- Updated URL patterns to include the new ping endpoint and adjusted imports accordingly.