feat: initial NixOS home lab infrastructure setup

- Add modular flake-based NixOS configuration
- Implement GitOps foundation with CI/CD pipeline
- Create comprehensive documentation and branching strategy
- Add modular desktop environments (GNOME, Cosmic, Sway)
- Configure virtualization stack (Incus, Libvirt, Podman)
- Set up development tools and hardware-specific modules
- Establish user configuration with literate programming support

This commit represents the completion of Phase 1: Flakes Migration
with modular configuration, virtualization, and GitOps foundation.

modules/desktop/sway.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, ... }: {
+  # Sway Window Manager (Wayland-based i3 replacement)
+  programs.sway = {
+    enable = true;
+    wrapperFeatures.gtk = true;
+  };
+
+  # Sway-specific packages
+  environment.systemPackages = with pkgs; [
+    # Core Sway tools
+    swaylock
+    swayidle
+    swaybg
+    
+    # Wayland utilities
+    waybar          # Status bar
+    fuzzel          # Application launcher
+    gammastep       # Blue light filter
+    mako            # Notification daemon
+    flameshot       # Screenshot tool
+    wl-clipboard    # Clipboard utilities
+    
+    # Additional Wayland tools
+    grim            # Screenshot utility
+    slurp           # Screen area selection
+    wf-recorder     # Screen recorder
+  ];
+}