feat(nixos): add multi-arch support and refactor system configs

- add aarch64-linux to supported systems (flake + pkgs)
- refactor host definitions into tty/desktop/laptop configurations
- introduce sharedModules to reduce duplication
- split system modules into base, gui, and laptop groups
- add headless (tty) configuration

feat(fish): add Ctrl+Delete and Alt+Delete bindings
- Ctrl+Delete → kill-word
- Alt+Delete → kill-token

chore(hosts): remove explicit hostname from aesthetic

chore(services): remove forced disable of speechd

system/default.nix

@@ -1,28 +1,37 @@
 let
-  desktop = [
-    ./core/boot.nix
+  # Base system - common for all configurations
+  base = [
     ./core/default.nix
 
-    ./hardware/graphics.nix
     ./hardware/fwupd.nix
-
     ./network/default.nix
 
     ./programs
 
-    ./services
     ./services/docker.nix
-    ./services/greetd.nix
-    ./services/pipewire.nix
     ./services/xdg-portal-fix.nix
   ];
 
-  laptop =
-    desktop
-    ++ [
-      ./hardware/bluetooth.nix
-      ./services/power.nix
-    ];
+  # GUI-specific modules (display manager, GPU, pipewire)
+  gui = [
+    ./core/boot.nix          # plymouth boot splash
+    ./hardware/graphics.nix   # GPU drivers
+    ./services/greetd.nix      # display manager
+    ./services/pipewire.nix   # audio
+  ];
+
+  # Laptop-specific modules (battery, bluetooth)
+  laptop = [
+    ./hardware/bluetooth.nix
+    ./services/power.nix
+  ];
 in {
-  inherit desktop laptop;
+  # TTY: desktop headless (no GUI)
+  tty = base;
+
+  # Desktop: desktop with GUI
+  desktop = base ++ gui;
+
+  # Laptop: laptop with GUI + battery + bluetooth
+  laptop = base ++ gui ++ laptop;
 }

system/services/default.nix

@@ -11,7 +11,6 @@
 
     irqbalance.enable = true;
     thermald.enable = true;
-    speechd.enable = lib.mkForce false;
   };
 
   # Use in place of hypridle's before_sleep_cmd, since systemd does not wait for