feat(web): vite+react+ts+tailwind4 scaffold, vitest, /api dev proxy

web/src/App.tsx

@@ -0,0 +1,3 @@
+export default function App() {
+  return <div className="p-8 text-zinc-400">booklib web</div>;
+}

web/src/index.css

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+@import "tailwindcss";
+
+html,
+body,
+#root {
+  height: 100%;
+}
+body {
+  @apply bg-zinc-950 text-zinc-100 antialiased;
+}
+::-webkit-scrollbar {
+  width: 10px;
+  height: 10px;
+}
+::-webkit-scrollbar-thumb {
+  @apply rounded bg-zinc-700;
+}

web/src/main.tsx

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+import { createRoot } from "react-dom/client";
+import App from "./App";
+import "./index.css";
+
+createRoot(document.getElementById("root")!).render(<App />);