Add Vue + Vite port of the logo generator

Single-file component (App.vue) over the shared src/logo.js core.
Reactive state via reactive(); v-model drives controls, computed
properties produce the live logo style and generated CSS. Keeps the
accessibility markup (labels, aria, <details>/<summary>, focus
rings); reset restores defaults through the form's @reset handler.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vite.config.js

@@ -0,0 +1,6 @@
+import { defineConfig } from 'vite';
+import vue from '@vitejs/plugin-vue';
+
+export default defineConfig({
+  plugins: [vue()],
+});