feat(just): add init-home recipe

modules/system/justfile.nix

@@ -2,6 +2,8 @@
 
 let
   justfileText = ''
+    FORCE := "0"
+
     [no-cd]
     manage:
         $EDITOR ~/.config/home-manager/home.nix
@@ -22,10 +24,40 @@ let
     update:
         sudo nix flake update --flake "''${NIXOS_FLAKE:-/etc/nixos}"
         just rebuild
+
+    [no-cd]
+    init-home:
+        #!/usr/bin/env bash
+        set -euo pipefail
+
+        src="/etc/skel/.config/home-manager"
+        dst="${XDG_CONFIG_HOME:-$HOME/.config}/home-manager"
+
+        mkdir -p "$dst"
+        chmod 700 "$dst" || true
+
+        overwrite="0"
+        if [[ "${FORCE}" == "1" ]]; then
+          overwrite="1"
+        elif [[ -e "$dst/flake.nix" || -e "$dst/home.nix" ]]; then
+          read -r -p "Home Manager files already exist in $dst. Overwrite? [y/N] " ans
+          case "${ans:-}" in
+            y|Y|yes|YES) overwrite="1" ;;
+            *) overwrite="0" ;;
+          esac
+        fi
+
+        for f in flake.nix home.nix; do
+          if [[ "$overwrite" == "1" || ! -e "$dst/$f" ]]; then
+            install -m 600 "$src/$f" "$dst/$f"
+            echo "copied $f -> $dst/$f"
+          else
+            echo "kept   $dst/$f"
+          fi
+        done
   '';
 in
 {
   # Global Just recipes (system-wide). Used when `XDG_CONFIG_DIRS` includes `/etc/xdg` (default).
   environment.etc."xdg/just/justfile".text = justfileText;
 }
-