Changes:
- Added missing include for MenuHelper.h in project and AdminMenu
- Fixed typo in variable name inventoryIems to inventoryItems in Controller.cpp
- Removed stray semicolon from include in Controller.h
- Cleaned up duplicate comments in Controller.cpp description header
- Minor formatting adjustments with blank lines after headers in multiple files
- Updated ServiceManagementService notification message to remove informal wording
- Refactored AdminMenu::changePassword to use changePasswordHelper
- Added util::clear() call at start of viewStockLevels
- Removed redundant helper functions from AdminMenu.cpp and moved to shared helpers
- Fixed bug in removeInventoryItem to use activeItems instead of inventoryItems
- Enhanced createComboPackages to enforce selection of two distinct services
- General comment cleanup and formatting consistency across headers and implementation files