feat: add little-rascal laptop configuration and deployment

- Add complete NixOS configuration for little-rascal laptop
- Include Niri window manager and CLI-focused setup
- Add hardware configuration for laptop hardware
- Include deployment script for little-rascal
- Update flake.nix to include little-rascal as build target
- Add deploy-rs configuration for little-rascal deployment

The little-rascal laptop is now fully integrated into the Home Lab
infrastructure with complete NixOS configuration management.

machines/little-rascal/minimal-configuration.nix

@@ -0,0 +1,107 @@
+# Minimal NixOS Configuration for little-rascal
+# This is for initial installation - use deploy-rs to apply full config afterwards
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  # Enable flakes for configuration deployment
+  nix.settings.experimental-features = ["nix-command" "flakes"];
+
+  # Boot configuration
+  boot = {
+    loader = {
+      systemd-boot.enable = true;
+      efi.canTouchEfiVariables = true;
+      timeout = 3;
+    };
+
+    # Import hardware scan results
+    initrd.availableKernelModules = ["xhci_pci" "ahci" "nvme" "usb_storage" "sd_mod"];
+    kernelModules = ["kvm-amd"];
+
+    # Clean tmp on boot
+    tmp.cleanOnBoot = true;
+  };
+
+  # Minimal file systems - you'll need to adjust this based on your disk setup
+  fileSystems."/" = {
+    device = "/dev/disk/by-label/nixos";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-label/BOOT";
+    fsType = "vfat";
+  };
+
+  # Basic networking
+  networking = {
+    hostName = "little-rascal";
+    networkmanager.enable = true;
+
+    # Open SSH port
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [22];
+      allowedUDPPorts = [41641]; # Tailscale
+    };
+  };
+
+  # Essential services
+  services = {
+    # SSH for remote deployment
+    openssh = {
+      enable = true;
+      settings = {
+        PasswordAuthentication = false;
+        KbdInteractiveAuthentication = false;
+        PermitRootLogin = "prohibit-password";
+        PubkeyAuthentication = true;
+      };
+    };
+
+    # Tailscale for secure home lab access
+    tailscale.enable = true;
+  };
+
+  # Create admin user for deployment
+  users = {
+    mutableUsers = false;
+    users = {
+      root = {
+        # Add your SSH public key here for initial access
+        openssh.authorizedKeys.keys = [
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPgzKS1N7+7+N1/8U8++1pl4hapDm6TOy0QhrfrYA8mz geir@geokkjer.eu-admin" # Admin key
+        ];
+      };
+
+      geir = {
+        isNormalUser = true;
+        extraGroups = ["wheel" "networkmanager" "sudo"];
+        openssh.authorizedKeys.keys = [
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHukJK0Kc1YexvzF8PdqaqWNZdVffGoM6ePPMecrU6dM geir@geokkjer.eu-dev" # Dev key
+          "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPgzKS1N7+7+N1/8U8++1pl4hapDm6TOy0QhrfrYA8mz geir@geokkjer.eu-admin" # Admin key for backup access
+        ];
+      };
+    };
+  };
+
+  # Sudo configuration
+  security.sudo = {
+    enable = true;
+    wheelNeedsPassword = false;
+  };
+
+  # Basic packages for system management
+  environment.systemPackages = with pkgs; [
+    git
+    vim
+    htop
+    curl
+    wget
+  ];
+  # System version
+  system.stateVersion = "25.05";
+}