feat: initialize repo with NixOS and Home Manager configs

- Add .gitignore for common languages, tools, and OS/editor artifacts
- Configure .gitattributes for Git LFS (fonts, images, archives, ISOs)
- Add README with repo description
- Add flake.nix defining inputs and outputs for NixOS, Home Manager, and related modules
- Introduce home-manager configs:
  - Base home.nix with packages, services, and programs
  - Hyprland WM configuration (waybar, fuzzel, keybindings, theming)
  - Vim (nixvim) setup with LSP and plugins
  - Zsh setup with aliases, Oh My Zsh, clipboard helpers
  - Systemd user services (e.g., librespot)
- Add scripts (GPU monitor, RAM build helper, install automation)
- Add host configurations:
  - Nixbook (Apple laptop) with hardware, disko, and install script
  - Nixstation (desktop) with firewall, virtualization, Btrfs scrub timer
  - Nixtest (test VM) with QEMU + Alpine-based install test harness
  - Common modules (network, NVIDIA, rclone, screen, keychron, users)
- Include statix config for linting

hosts/Nixtest/scripts/install_test_shell.nix

@@ -0,0 +1,22 @@
+{ pkgs ? import <nixpkgs> { }
+,
+}:
+
+pkgs.mkShell {
+  name = "nixos-anywhere-test-env";
+
+  packages = with pkgs; [
+    nix
+    nixos-anywhere
+    openssh
+    sshpass
+    qemu_full
+    wget
+  ];
+
+  shellHook = ''
+    echo "Entered NixOS Anywhere Test Environment."
+    echo "Alpine image will be downloaded if needed."
+    echo "Run ./install_test.sh to start the QEMU VM and run the installation."
+  '';
+}