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.

packages/default.nix

@@ -0,0 +1,16 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+{
+  # Custom packages for Home-lab infrastructure
+  
+  # Home-lab specific tools and utilities
+  home-lab-tools = pkgs.callPackage ./home-lab-tools.nix { };
+  
+  # Re-export commonly used packages with custom configurations
+  inherit (pkgs)
+    # Core utilities that might be customized
+    git
+    curl
+    wget
+    ;
+}