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>

modules/home/waybar.nix

@@ -1,10 +1,10 @@
-{ config, pkgs, ... }:
+{ config, pkgs, lib, ... }:
 
 {
   programs.waybar = {
-    enable = true;
-    systemd.enable = true;
-    style = ''
+    enable = lib.mkDefault true;
+    systemd.enable = lib.mkDefault true;
+    style = lib.mkDefault ''
       * {
         background-color: #${config.colorScheme.palette.base00};
         color: #${config.colorScheme.palette.base05};
@@ -25,7 +25,7 @@
         min-width: 9px;
         color: #${config.colorScheme.palette.base04};
       }
-      
+
       #workspaces button.focused, #workspaces button.active {
         color: #${config.colorScheme.palette.base0B};
       }
@@ -40,10 +40,10 @@
       #tray { margin-right: 16px; }
       #bluetooth { margin-right: 17px; }
     '';
-    settings = [ (builtins.fromJSON (builtins.readFile ../../config/waybar/config.jsonc)) ];
+    settings = lib.mkDefault [ (builtins.fromJSON (builtins.readFile ../../config/waybar/config.jsonc)) ];
   };
 
-  home.packages = with pkgs; [
+  home.packages = lib.mkDefault (with pkgs; [
     font-awesome
-  ];
+  ]);
 }