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/state.nix

@@ -0,0 +1,21 @@
+{ lib, ... }:
+
+let
+  nomarchyLib = import ../lib { inherit lib; };
+  systemState = nomarchyLib.readSystemState;
+in
+{
+  config.nomarchy.system = {
+    dns = systemState.dns or "DHCP";
+    customDns = systemState.customDns or [];
+    wifi.powersave = systemState.wifi.powersave or true;
+    timezone = systemState.timezone or "UTC";
+    features = {
+      fingerprint = systemState.features.fingerprint or false;
+      fido2 = systemState.features.fido2 or false;
+      hybridGPU = systemState.features.hybridGPU or false;
+      makima = systemState.features.makima or false;
+    };
+    theme = systemState.theme or "nord";
+  };
+}