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/network.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, lib, ... }:
+
+let
+  cfg = config.nomarchy.system;
+in
+{
+  networking.networkmanager.enable = lib.mkDefault true;
+
+  networking.networkmanager.wifi.powersave = lib.mkDefault cfg.wifi.powersave;
+
+  # DNS Configuration
+  networking.nameservers = lib.mkDefault (
+    if cfg.dns == "Cloudflare" then [ "1.1.1.1" "1.0.0.1" ]
+    else if cfg.dns == "Google" then [ "8.8.8.8" "8.8.4.4" ]
+    else if cfg.dns == "Custom" then cfg.customDns
+    else [] # DHCP lets NM handle it
+  );
+
+  services.resolved = {
+    enable = lib.mkDefault (cfg.dns != "DHCP");
+    dnssec = lib.mkDefault "allow-downgrade";
+    domains = lib.mkDefault [ "~." ];
+    fallbackDns = lib.mkDefault [ "9.9.9.9" "149.112.112.112" ];
+    extraConfig = lib.mkDefault ''
+      DNSOverTLS=opportunistic
+    '';
+  };
+}