Add vue3-vite scaffold: skill, script, shell wrapper, and prompt

- resources/skills/vue3-vite/SKILL.md: procedure, outputs, and atomic design conventions
- resources/scripts/scaffold-vue3-vite.mjs: self-contained scaffold generating package.json, vite.config.js, index.html, router, pages, atomic component dirs, and SCSS foundations
- resources/scripts/scaffold-vue3-vite.sh: Node.js-delegating shell wrapper
- resources/prompts/scaffold-vue3-vite.prompt.md: chat-invocable prompt following shared pattern

resources/scripts/scaffold-vue3-vite.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd -P)"
+
+if command -v node >/dev/null 2>&1; then
+  node_bin="$(command -v node)"
+elif command -v nodejs >/dev/null 2>&1; then
+  node_bin="$(command -v nodejs)"
+else
+  printf 'Node.js is required to scaffold a Vue 3 + Vite project.\n' >&2
+  exit 1
+fi
+
+exec "$node_bin" "$script_dir/scaffold-vue3-vite.mjs" "$@"