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/hardware/amd-workstation.nix

@@ -0,0 +1,30 @@
+{ config, pkgs, ... }: {
+  # AMD GPU configuration
+  hardware.amdgpu.initrd.enable = true;
+
+  # Firmware updates and proprietary firmware
+  services.fwupd.enable = true;
+  hardware.enableRedistributableFirmware = true;
+
+  # Bluetooth configuration
+  hardware.bluetooth = {
+    enable = true;
+    powerOnBoot = true;
+  };
+
+  # ZRAM swap configuration
+  zramSwap = {
+    enable = true;
+    algorithm = "zstd";
+  };
+
+  # Audio system (PipeWire)
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    pulse.enable = true;
+  };
+
+  # Gaming support
+  programs.steam.enable = true;
+}