Import Tripoli Cloud frontend prototype

React/TypeScript/Vite/Tailwind prototype from the design session (login,
dashboard, photos, backups, settings views with mocked API layer).
Infra work (Rust services, Ansible, OpenTofu) follows in subsequent commits.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/vite.config.ts

@@ -0,0 +1,10 @@
+import react from '@vitejs/plugin-react'
+import { defineConfig } from 'vite'
+
+// https://vite.dev/config/
+export default defineConfig({
+  // Relative asset paths: the built app is served as static files from
+  // whatever domain/path the reverse proxy mounts it under, never localhost.
+  base: './',
+  plugins: [react()],
+})