refactor: major architectural restructure for theme-centric organization

Theme System:
- Move all theme app configs to apps/ subdirectory (20 themes)
- Add theme-loader.nix for dynamic theme config deployment
- Simplify stylix.nix to focus on base theming only

Override System:
- Add overrides.nix for file-based config overrides
- Add behavior-configs.nix for non-visual configuration
- Split hypr/nomarchy.conf into behavior vs visual sections

Module Improvements:
- Add lib.mkDefault to all customizable settings
- Add modules/lib/ with shared utilities and state schema
- Update all home and system modules for downstream overridability

Installer:
- New minimal TTY installer (installer/install.sh)
- Golden path: BTRFS + LUKS2 (disko-golden.nix)
- New installer-iso.nix for TTY-only installation
- Keep graphical installer as installerIsoGraphical option

Cleanup:
- Remove obsolete install.sh, disko-ext4.nix, install-nomarchy.sh
- Update live-iso.nix references
- Add .claude/ to .gitignore for local IDE settings

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

hosts/installer-iso.nix

@@ -0,0 +1,95 @@
+{ config, pkgs, inputs, lib, ... }:
+
+# Minimal TTY Installer ISO Configuration
+#
+# This creates a minimal, text-only installation environment.
+# No desktop environment - just TTY with gum-based installer.
+
+{
+  # Base installation media configuration is handled by the module imported in flake.nix
+
+  # Console configuration for a pleasant TTY experience
+  console = {
+    font = "ter-v16n";
+    packages = [ pkgs.terminus_font ];
+  };
+
+  # Essential packages for installation
+  environment.systemPackages = with pkgs; [
+    # Core utilities
+    git
+    vim
+    curl
+    wget
+
+    # TUI installer dependencies
+    gum
+
+    # Disk tools
+    inputs.disko.packages.${pkgs.stdenv.hostPlatform.system}.disko
+    parted
+    btrfs-progs
+    cryptsetup
+
+    # Network tools
+    networkmanager
+
+    # System info
+    lshw
+    pciutils
+    usbutils
+
+    # Installer command
+    (pkgs.writeShellScriptBin "nomarchy-install" ''
+      exec /etc/install.sh "$@"
+    '')
+  ];
+
+  # Enable NetworkManager for easy network setup
+  networking.networkmanager.enable = true;
+
+  # Auto-login to TTY as root for installation
+  services.getty.autologinUser = lib.mkForce "root";
+
+  # Display welcome message and installer info
+  environment.etc."motd".text = ''
+
+    ╔══════════════════════════════════════════════════════════════╗
+    ║                                                              ║
+    ║                   NOMARCHY INSTALLER                         ║
+    ║                                                              ║
+    ║   Run 'nomarchy-install' to start the installation wizard    ║
+    ║                                                              ║
+    ║   For network setup: nmtui                                   ║
+    ║   For manual install: see /etc/nomarchy/                     ║
+    ║                                                              ║
+    ╚══════════════════════════════════════════════════════════════╝
+
+  '';
+
+  # Make the installer script available
+  environment.etc."install.sh" = {
+    source = ../installer/install.sh;
+    mode = "0755";
+  };
+
+  # Symlink for easy access (merged into systemPackages above)
+  # The nomarchy-install script is created by writeShellScriptBin in the main list
+
+  # Include disko configurations
+  environment.etc."disko-golden.nix".source = ../installer/disko-golden.nix;
+
+  # Include Nomarchy source for installation
+  environment.etc."nomarchy".source = inputs.self;
+
+  # Disable graphical stuff - this is TTY only
+  services.xserver.enable = false;
+  services.displayManager.sddm.enable = lib.mkForce false;
+
+  # Ensure we have a proper shell environment
+  programs.bash.completion.enable = true;
+
+  # Include documentation
+  documentation.enable = true;
+  documentation.man.enable = true;
+}