feat: enhance x86-64 support, refine virtualization, and update kernel config

Detailed Description:

• Added support for a generic x86-64 machine configuration, requiring manual intervention during installation.
• Fixed an issue where virt-manager was unnecessarily included in builds for non-virtualized systems.
• Introduced unattended virtualization-based Windows installation:
  • Downloads a pre-configured Windows ISO processed with NTLITE to skip user interaction via EFI file adjustments.
  • Automates installation of Windows onto the target disk using virtualization techniques.
  • Automatically selects the appropriate installation disk based on machine model.
• Modified root filesystem:
  • Removed the igh-ethercat service.
  • Enabled default installation of kernel-modules.
• Enhanced virtualization system:
  • Integrated default inclusion of KVM modules for both Intel and AMD platforms.
• Updated kernel configuration:
  • Adopted a segmented integration approach for the configuration file.
  • Based on the 5.15.51 kernel configuration version.
• Fixed issues with menuconfig during kernel build.
• Fixed root and metaos users' default shell to bash.
• Added disk flashing script to facilitate R&D debugging.
• Updated RTE version to resolve webvisu installation failure.
• Resolved polkit conflict in XFCE.
• Corrected VNC service script syntax for auto-start on boot.
• Removed xfce4-session and set lxdm as the default login manager.
• Changed the default desktop background image.

These changes improve system compatibility, streamline virtualized installation workflows, enhance kernel build configurations, and address key system-level issues related to user environment, service management, and desktop experience.