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

flake.nix

@@ -27,8 +27,8 @@
     inherit inputs;
 
     nixosModules = {
-      system = import ./modules/system;
-      home = import ./modules/home;
+      system = import ./core;
+      home = import ./features;
     };
 
     nixosConfigurations = {
@@ -53,7 +53,7 @@
           { nixpkgs.hostPlatform = "x86_64-linux"; }
           "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix"
           ./hosts/live-iso.nix
-          ./modules/system
+          ./core
           home-manager.nixosModules.home-manager
           {
             system.stateVersion = "25.11";
@@ -65,7 +65,7 @@
             home-manager.useGlobalPkgs = false;
             home-manager.useUserPackages = true;
             home-manager.users.nixos = {
-              imports = [ ./modules/home ];
+              imports = [ ./features ];
               home.username = "nixos";
               home.homeDirectory = "/home/nixos";
               home.stateVersion = "25.11";
@@ -80,8 +80,8 @@
         modules = [
           { nixpkgs.hostPlatform = "x86_64-linux"; }
           ./hosts/live-iso.nix
-          ./modules/system/default.nix
-          ./modules/system/vm-guest.nix
+          ./core/default.nix
+          ./core/system/vm-guest.nix
           home-manager.nixosModules.home-manager
           {
             system.stateVersion = "25.11";
@@ -97,7 +97,7 @@
             home-manager.useGlobalPkgs = false;
             home-manager.useUserPackages = true;
             home-manager.users.nixos = {
-              imports = [ ./modules/home/default.nix ];
+              imports = [ ./features/default.nix ];
               home.username = "nixos";
               home.homeDirectory = "/home/nixos";
               home.stateVersion = "25.11";
@@ -117,8 +117,8 @@
         specialArgs = { inherit inputs; };
         modules = [
           { nixpkgs.hostPlatform = "x86_64-linux"; }
-          ./modules/system/default.nix
-          ./modules/system/vm-guest.nix
+          ./core/default.nix
+          ./core/system/vm-guest.nix
           home-manager.nixosModules.home-manager
           {
             system.stateVersion = "25.11";
@@ -141,7 +141,7 @@
             home-manager.useGlobalPkgs = false;
             home-manager.useUserPackages = true;
             home-manager.users.nomarchy = {
-              imports = [ ./modules/home/default.nix ];
+              imports = [ ./features/default.nix ];
               home.username = "nomarchy";
               home.homeDirectory = "/home/nomarchy";
               home.stateVersion = "25.11";