add Vite Vue 3 TypeScript frontend skeleton.

Minimal home view and dev server on port 5173 for later Docker wiring.

frontend/src/App.vue

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+<template>
+  <main class="home">
+    <h1>Private Image</h1>
+  </main>
+</template>
+
+<style scoped>
+.home {
+  box-sizing: border-box;
+  min-height: 100vh;
+  margin: 0;
+  padding: 2rem;
+  font-family:
+    system-ui,
+    -apple-system,
+    Segoe UI,
+    Roboto,
+    sans-serif;
+  line-height: 1.5;
+}
+
+h1 {
+  margin: 0 0 0.5rem;
+  font-size: 1.75rem;
+  font-weight: 600;
+}
+
+p {
+  margin: 0;
+  color: #444;
+}
+</style>

frontend/src/main.ts

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+import { createApp } from 'vue';
+import App from './App.vue';
+
+createApp(App).mount('#app');

frontend/src/vite-env.d.ts

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+/// <reference types="vite/client" />