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>

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "demo-ecmascript-vue",
+  "version": "1.0.0",
+  "description": "LIBRETECH logo generator — Vue + Vite",
+  "repository": {
+    "type": "git",
+    "url": "ssh://tengo@git.librete.ch:41240/public/demo-ecmascript.git"
+  },
+  "license": "WTFPL",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "vue": "^3.5.13"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^5.2.1",
+    "vite": "^6.0.0"
+  }
+}