feat(system): comprehensive branding, styling, and system feature update

- Relocate themes to assets/themes/ and update all references.
- Implement custom SDDM theme and Plymouth theme enhancements.
- Add themed templates for Alacritty, Hyprland, Waybar, and other apps.
- Introduce Makima key remapper module and configuration.
- Add Voxtype and Walker configurations.
- Implement systemd power management and timeout optimizations.
- Add Nautilus-python extensions for LocalSend.
- Update branding assets and ASCII art integration.

modules/system/sddm.nix

@@ -1,11 +1,25 @@
 { config, pkgs, lib, ... }:
 
+let
+  nomarchy-sddm-theme = pkgs.stdenv.mkDerivation {
+    pname = "nomarchy-sddm-theme";
+    version = "1.0";
+    src = ../../assets/sddm/nomarchy;
+    installPhase = ''
+      mkdir -p $out/share/sddm/themes/nomarchy
+      cp -r * $out/share/sddm/themes/nomarchy/
+    '';
+  };
+in
 {
   services.displayManager.sddm = {
     enable = true;
     wayland.enable = true;
+    theme = "nomarchy";
   };
 
+  environment.systemPackages = [ nomarchy-sddm-theme ];
+
   # Enable Hyprland system-level dependencies
   programs.hyprland.enable = true;
 }