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/home/bash.nix

@@ -0,0 +1,39 @@
+{ config, lib, ... }:
+
+{
+  programs.bash = {
+    enable = true;
+
+    bashrcExtra = ''
+      if [[ -f ~/.config/nomarchy/default/bash/rc ]]; then
+        source ~/.config/nomarchy/default/bash/rc
+      fi
+    '';
+
+    shellAliases = lib.mkDefault {
+      # File system
+      lsa = "ls -a";
+
+      # Directories
+      ".." = "cd ..";
+      "..." = "cd ../..";
+      "...." = "cd ../../..";
+
+      # Tools
+      c = "opencode";
+      d = "docker";
+      r = "rails";
+      t = "tmux attach || tmux new -s Work";
+
+      # Git
+      g = "git";
+      gcm = "git commit -m";
+      gcam = "git commit -a -m";
+      gcad = "git commit -a --amend";
+
+      # NixOS commands
+      sys-update = "sudo nixos-rebuild switch --flake /etc/nixos#default --impure";
+      env-update = "nomarchy-preflight-migration && home-manager switch --flake /etc/nixos#default --impure";
+    };
+  };
+}