feat(app): scaffold Vue3 frontend (stage 1)

app-frontend/vite.config.js

@@ -0,0 +1,13 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+export default defineConfig({
+  plugins: [vue()],
+  base: './',
+  build: {
+    outDir: '../static/app',
+    emptyOutDir: true,
+    manifest: true,
+  },
+})
+