Initial commit: Nomarchy NixOS configuration

An opinionated NixOS configuration with Hyprland, featuring:

- Modular flake-based architecture
- Parameterized user configuration (username, timezone, locale, etc.)
- Classical/antiquity theme with Thomas Cole wallpapers
- Full Hyprland setup with waybar, rofi, swaync
- Custom utility scripts (screenshots, screen recording, WiFi QR)
- Neovim with LSP support
- Interactive installer for existing NixOS systems
- ISO builder for fresh installations

Flake outputs:
- nixosConfigurations.example - Test configuration
- nixosConfigurations.installer - ISO installer
- packages.iso - Bootable ISO image
- apps.default - Interactive installer
- lib.mkHost - Host builder function
- templates.default - Starter template

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

modules/desktop/display-manager.nix

@@ -0,0 +1,25 @@
+# Display manager configuration
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  # X11 server (for SDDM and fallback)
+  services.xserver.enable = true;
+
+  # SDDM display manager with Wayland support
+  services.displayManager.sddm = {
+    enable = true;
+    wayland.enable = true;
+  };
+
+  # Plasma 6 as fallback desktop (optional)
+  services.desktopManager.plasma6.enable = true;
+
+  # KDE Connect for phone integration
+  programs.kdeconnect.enable = true;
+
+  # X keyboard layout (for SDDM)
+  services.xserver.xkb.layout = "us";
+}