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

modules/home/scripts.nix

@@ -15,6 +15,12 @@ let
     jq
     swww
     xmlstarlet
+    wl-clipboard
+    grim
+    slurp
+    brightnessctl
+    playerctl
+    pamixer
     # Add any others commonly used in bin/
   ];