Split configuration.nix and home.nix into per-domain modules

Break the two monolithic files into focused modules under system/
and home/ so each concern (boot, networking, xserver, picom, zsh,
git, rofi, etc.) lives in its own file. Clean up duplicates: drop
rofi from home.packages since programs.rofi.enable already installs
it, and move user-only apps (alacritty, obsidian, claude-code) from
environment.systemPackages to home.packages. Remove commented-out
boilerplate carried over from the install template.

configuration.nix

@@ -1,121 +1,21 @@
-{ config, lib, pkgs, ... }:
+{ ... }:
 
 {
-  imports =
-    [ # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-    ];
-
-  # Use the systemd-boot EFI boot loader.
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
-
-  networking.hostName = "hivebrain"; # Define your hostname.
-
-  # Configure network connections interactively with nmcli or nmtui.
-  networking.networkmanager.enable = true;
-
-  # Set your time zone.
-  time.timeZone = "Europe/Berlin";
-
-  # Select internationalisation properties.
-  # i18n.defaultLocale = "en_US.UTF-8";
-  # console = {
-  #   font = "Lat2-Terminus16";
-  #   keyMap = "de";
-  #   useXkbConfig = true; # use xkb.options in tty.
-  # };
-
-  # Enable the X11 windowing system.
-  # services.xserver.enable = true;
-
-  services.xserver = {
-    enable = true;
-    autoRepeatDelay = 200;
-    autoRepeatInterval = 35;
-    windowManager.qtile.enable = true;
-    displayManager.sessionCommands = ''
-      xwallpaper --zoom ~/nixos-dotfiles/Pictures/NixOsWallpaper.png
-    '';
-    xrandrHeads = [
-      {
-        output = "HDMI-1";
-        monitorConfig = ''
-          Option "Position" "0 0"
-        '';
-      }
-      {
-        output = "DP-1";
-        primary = true;
-        monitorConfig = ''
-          Option "Position" "1920 0"
-        '';
-      }
-    ];
-  };
-
-  services.displayManager.ly.enable = true;
-
-  services.picom = {
-    enable = true;
-    backend = "xrender";
-    fade = true;
-  };
-
-  fonts.packages = with pkgs; [
-    jetbrains-mono
+  imports = [
+    ./hardware-configuration.nix
+    ./system/boot.nix
+    ./system/networking.nix
+    ./system/locale.nix
+    ./system/xserver.nix
+    ./system/picom.nix
+    ./system/display-manager.nix
+    ./system/fonts.nix
+    ./system/users.nix
+    ./system/programs.nix
+    ./system/packages.nix
+    ./system/ssh.nix
+    ./system/nix.nix
   ];
 
-  # Enable sound.
-  # services.pulseaudio.enable = true;
-  # OR
-  # services.pipewire = {
-  #   enable = true;
-  #   pulse.enable = true;
-  # };
-
-  nixpkgs.config.allowUnfree = true;
-
-  # Define a user account. Don't forget to set a password with ‘passwd’.
-  users.users.marvin = {
-    isNormalUser = true;
-    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
-    shell = pkgs.zsh;
-    packages = with pkgs; [
-      tree
-    ];
-  };
-
-  programs.firefox.enable = true;
-  programs.zsh.enable = true;
-
-  # List packages installed in system profile.
-  # You can use https://search.nixos.org/ to find more packages (and options).
-  environment.systemPackages = with pkgs; [
-    vim 
-    wget
-    alacritty
-    btop
-    obsidian
-    claude-code
-    jq          # used by the Claude vault bootstrap.sh to parse settings.json
-  ];
-
-  nix.settings.experimental-features = ["nix-command" "flakes"];
-
-  # Some programs need SUID wrappers, can be configured further or are
-  # started in user sessions.
-  # programs.mtr.enable = true;
-  # programs.gnupg.agent = {
-  #   enable = true;
-  #   enableSSHSupport = true;
-  # };
-
-  # List services that you want to enable:
-
-  # Enable the OpenSSH daemon.
-  services.openssh.enable = true;
-  
-  system.stateVersion = "26.05"; 
+  system.stateVersion = "26.05";
 }
-