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/configs.nix

@@ -2,7 +2,6 @@
 
 {
   xdg.configFile = {
-    "alacritty".source = ../../config/alacritty;
     "btop".source = ../../config/btop;
     "chromium".source = ../../config/chromium;
     "fastfetch".source = ../../config/fastfetch;