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/home-default.nix

@@ -0,0 +1,45 @@
+{ config, pkgs, nixvim, claude-code, ... }:
+
+{
+  imports = [ 
+    nixvim.homeModules.nixvim
+    ../../modules/nvim.nix 
+    ../../modules/tmux.nix 
+    ../../modules/zsh.nix 
+    ../../modules/ssh.nix
+    ../../modules/git.nix
+    ../../modules/lazygit.nix
+    ../../modules/termscp.nix
+    ../../modules/rsync.nix
+    ../../modules/btop.nix
+    ../../config/fonts.nix
+  ];
+
+  home.username = "yanlin";
+  home.homeDirectory = "/home/yanlin";
+  home.stateVersion = "24.05";
+
+  programs.home-manager.enable = true;
+
+  home.packages = with pkgs; [
+    # Network and file transfer
+    lftp
+    httpie
+    openssh
+    gnumake
+    
+    # Command-line utilities
+    ncdu
+    git-credential-oauth
+    zoxide
+    delta
+    fastfetch
+
+    # Development and build tools
+    python312
+    uv
+    claude-code.packages.x86_64-linux.claude-code
+    lazysql
+    sqlite
+  ];
+}