This commit updates various modules to utilize the secure file system operations from the secureFs module instead of the native fs module. Key changes include:
- Replaced fs imports with secureFs in multiple route handlers and services to enhance security and consistency in file operations.
- Added centralized validation for working directories in the sdk-options module to ensure all AI model invocations are secure.
These changes aim to improve the security and maintainability of file handling across the application.
- Deleted the CoursePromoBadge component from the sidebar and its associated logic.
- Removed references to the hideMarketingContent setting from the settings view and appearance section.
- Cleaned up related tests for marketing content visibility as they are no longer applicable.
