Initial commit: installable PWA hello world

React + TypeScript + Tailwind v4 + shadcn/ui frontend (client), Express +
better-sqlite3 backend (server) in a pnpm workspace. Includes vite-plugin-pwa
manifest, service worker, and iOS install meta tags. GET /api/hello increments a
visit counter in SQLite; backend serves the built client in production.

client/pwa-assets.config.ts

@@ -0,0 +1,6 @@
+import { defineConfig, minimal2023Preset } from '@vite-pwa/assets-generator/config'
+
+export default defineConfig({
+  preset: minimal2023Preset,
+  images: ['public/icon.svg'],
+})