fix: update module script check to verify existence only

scripts/30-install-packages.sh

@@ -16,8 +16,8 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
     dotfiles_dir="$1"
     module_script="$dotfiles_dir/packages/install.sh"
 
-    if [ ! -x "$module_script" ]; then
-        log_error "Module script not found or not executable: $module_script"
+    if [ ! -f "$module_script" ]; then
+        log_error "Module script not found: $module_script"
         exit 1
     fi
     bash "$module_script" "$dotfiles_dir"