refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

core/system/audio.nix

@@ -0,0 +1,12 @@
+{ config, pkgs, lib, ... }:
+
+{
+  security.rtkit.enable = lib.mkDefault true;
+  services.pipewire = {
+    enable = lib.mkDefault true;
+    alsa.enable = lib.mkDefault true;
+    alsa.support32Bit = lib.mkDefault true;
+    pulse.enable = lib.mkDefault true;
+    jack.enable = lib.mkDefault true;
+  };
+}