Fix vt_data auto-update inconsistency and hardware zone bugs

[No0ne558]

Description:

This PR addresses two critical bugs in the ViewTouch POS system:

Changes

1. Fix vt_data auto-update inconsistency between server and external displays

• Problem: The vt_data auto-update feature worked correctly on server displays but incorrectly updated on external displays, even when disabled in settings.
• Root Cause: The auto-update setting was loaded using display-specific data paths, causing inconsistent behavior between server and external displays.
• Solution: Modified manager.cc to load the auto_update_vt_data setting from a fixed path (settings.dat) instead of using the display-dependent data_path.
• Impact: Ensures consistent auto-update behavior across all display types.

2. Fix Hardware zone bugs: duplicate server terminals and shared printer removal

• Problem: Hardware zones had issues with duplicate server terminals appearing and improper removal of shared printers.
• Root Cause: Logic errors in zone management and printer sharing code.
• Solution: Updated hardware_zone.cc and settings.cc to properly handle server terminal uniqueness and shared printer cleanup.
• Impact: Prevents duplicate terminals and ensures proper printer management in multi-zone setups.

Files Modified

• manager.cc: Updated auto-update settings loading logic
• hardware_zone.cc: Fixed server terminal and printer sharing logic
• settings.cc: Improved server terminal management
• changelog.md: Added documentation for both fixes

Testing

• Verified auto-update setting consistency across display types
• Confirmed hardware zone operations work correctly without duplicates
• All changes maintain backward compatibility

Commits

• 814eda3: Fix vt_data auto-update inconsistency between server and external displays
• ebc9581: Fix Hardware zone bugs: duplicate server terminals and shared printer removal