chore: clean up and optimize nixos configuration

- fix: nvidia.nix missing semicolon (build error)
- remove: ranger, vim from core/pkg.nix (yazi + neovim covers)
- remove: htop duplicate in home/pkg.nix (keep in system)
- replace: neofetch with fastfetch in home/pkg.nix
- remove: nixd LSP, keep nil only in nvchad.nix
- remove: empty server/pkg.nix and no-op server/firewall.nix
- remove: redundant services.pulseaudio.enable = false default
- add: comprehensive README.md documenting architecture

modules/core/pkg.nix

@@ -4,8 +4,6 @@
     curl
     git
     htop
-    ranger
-    vim
     wget
   ];
 }

modules/drivers/nvidia.nix

@@ -8,7 +8,7 @@
     open = true;
     nvidiaSettings = true;
     powerManagement.enable = false;
-    powerManagement.finegrained = false
+    powerManagement.finegrained = false;
     package = config.boot.kernelPackages.nvidiaPackages.latest;
   };
 

modules/server/default.nix

@@ -1,8 +1,6 @@
 { ... }:
 {
   imports = [
-    ./pkg.nix
-    ./firewall.nix
     ./docker.nix
     ./ssh.nix
   ];

modules/server/firewall.nix

@@ -1,4 +0,0 @@
-{ lib, ... }:
-{
-  networking.firewall.enable = lib.mkDefault true;
-}

modules/server/pkg.nix

@@ -1,6 +0,0 @@
-{ pkgs, ... }:
-{
-  environment.systemPackages = with pkgs; [
-    
-  ];
-}