Add NixOS dual-configuration setup (dev and gaming profiles)

Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>

modules/dev.nix

@@ -0,0 +1,86 @@
+{ pkgs, ... }:
+
+{
+  # Identification tag (shows in boot menu and `nixos-version`)
+  system.nixos.tags = [ "dev" ];
+
+  # --------------------------------------------------------------------------
+  # KERNEL - Latest stable for RDNA 4 GPU support
+  # --------------------------------------------------------------------------
+  # NOTE: LTS kernels often lag behind new GPU support.
+  # For RDNA 4 (RX 9060 XT), use linuxPackages_latest instead of linuxPackages.
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+
+  # --------------------------------------------------------------------------
+  # DOCKER
+  # --------------------------------------------------------------------------
+  virtualisation.docker = {
+    enable = true;
+    autoPrune = {
+      enable = true;
+      dates = "weekly";
+    };
+  };
+
+  # IMPORTANT: Replace <username> with actual username
+  users.users.<username>.extraGroups = [ "docker" ];
+
+  # --------------------------------------------------------------------------
+  # DEVELOPMENT TOOLS
+  # --------------------------------------------------------------------------
+  programs.direnv = {
+    enable = true;
+    nix-direnv.enable = true;  # Caches nix shells
+  };
+
+  # IMPORTANT: Replace <username> with actual username
+  users.users.<username>.packages = with pkgs; [
+    # -- Git --
+    lazygit
+    gh              # GitHub CLI
+
+    # -- Node.js --
+    nodejs_22
+    nodePackages.pnpm
+    nodePackages.yarn
+
+    # -- CLI Tools --
+    httpie          # HTTP client
+    jq              # JSON processor
+    yq              # YAML processor
+    fd              # Find alternative
+    ripgrep         # Grep alternative
+    eza             # ls alternative
+    bat             # cat alternative
+    fzf             # Fuzzy finder
+    zoxide          # cd alternative
+    delta           # Git diff viewer
+
+    # -- Database Clients --
+    postgresql      # psql client
+    # redis          # Uncomment if needed
+
+    # -- Misc --
+    gnumake
+    gcc
+  ];
+
+  # --------------------------------------------------------------------------
+  # SERVICES (Optional - uncomment if needed)
+  # --------------------------------------------------------------------------
+  # Local PostgreSQL
+  # services.postgresql = {
+  #   enable = true;
+  #   ensureDatabases = [ "devdb" ];
+  #   ensureUsers = [{
+  #     name = "<username>";
+  #     ensureDBOwnership = true;
+  #   }];
+  # };
+
+  # Local Redis
+  # services.redis.servers."dev" = {
+  #   enable = true;
+  #   port = 6379;
+  # };
+}