Add Hyprlock and refactor Hyprland bindings

- Add hyprlock module and package plus hyprlock.conf XDG config
- Rework bindings: introduce mkMenu, gui/term helpers and grouped
  menus (apps, dev, gaming, utility, system) and wire them into the
  main popup; change session lock to hyprlock
- Simplify gaming-apps.nix: use pkgs, reorder packages and add
  wineWow64Packages.staging, steam-run and appimage-run

home/system/hyprland/default.nix

@@ -19,6 +19,7 @@ in {
     ./animations.nix
     ./bindings.nix
     ./polkitagent.nix
+    ./hyprlock.nix
     ./keyboard-backlight.nix # CHANGEME: This is for omen laptop only
   ];
 
@@ -31,6 +32,7 @@ in {
     libxcb
     hyprland-qtutils
     adw-gtk3
+    hyprlock
     hyprshot
     hyprpicker
     swappy