feat: implement modular foundation and core system services

- Update flake.nix with 25.11 release and core inputs
- Add dedicated modules for audio (Pipewire), bluetooth, and networking
- Update GEMINI.md with the new Modular Merging Architecture blueprint
- Configure graphical installer ISO and test VM outputs

hosts/live-iso.nix

@@ -4,7 +4,14 @@
   environment.systemPackages = with pkgs; [
     git
     gum
-    inputs.disko.packages.${pkgs.system}.disko
+    inputs.disko.packages.${pkgs.stdenv.hostPlatform.system}.disko
+    (pkgs.makeDesktopItem {
+      name = "install-nomarchy";
+      desktopName = "Install Nomarchy";
+      exec = "alacritty -e sudo /etc/install-nomarchy.sh";
+      terminal = false;
+      categories = [ "System" ];
+    })
   ];
 
   environment.etc."install-nomarchy.sh" = {
@@ -19,4 +26,6 @@
   environment.etc."disko-btrfs-luks.nix" = {
     source = ../installer/disko-btrfs-luks.nix;
   };
+
+  environment.etc."nomarchy".source = inputs.self;
 }