Separated PipeWire audio configuration from bluetooth hardware settings for
better logical organization. Moved bluetooth config to hardware-configuration.nix
alongside kernel module workarounds (disable_ertm, iwlwifi power_save).
Also added documentation for permittedInsecurePackages in global config and
updated flake dependencies.
Add comprehensive inline documentation to both NixOS and Home Manager
global configuration files, explaining the purpose of each section,
overlay usage, unfree package policy, and configuration settings.
Move all allowUnfreePredicate declarations to global configs to prevent
the "last definition wins" merging issue. Unfree packages are now managed
in two central locations:
- NixOS system packages: nixos/common/global/default.nix
- Home Manager packages: home-manager/sajenim/global/default.nix
