Add NixOS home manager config and fix flake warnings

- Add hosts/nixos/home-default.nix with nvim, ssh, and other modules
- Add hosts/nixos/hs/home.nix importing home-default
- Fix nixpkgs.config conflict by moving allowUnfree to system level
- Fix root user password conflicts by explicitly clearing all options
- Add home-manager integration to hs system configuration
- Update hostId from placeholder to actual value (8425e349)
- Add claude-code support for x86_64-linux architecture

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

hosts/nixos/hs/home.nix

@@ -0,0 +1,11 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ../home-default.nix
+  ];
+
+  # hs-specific home configuration
+  # Example: Server-specific tools, monitoring utilities, etc.
+  
+}