feat(01-01): scaffold project with Vite, Hono, TanStack Router, Tailwind, and Drizzle config

- Initialize bun project with all frontend/backend dependencies
- Configure Vite with TanStack Router plugin, React, and Tailwind v4
- Create Hono server with health check and static file serving
- Set up TanStack Router file-based routes with root layout
- Add Drizzle config, Biome linter, and proper .gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/routes/__root.tsx

@@ -0,0 +1,14 @@
+import { createRootRoute, Outlet } from "@tanstack/react-router";
+import "../app.css";
+
+export const Route = createRootRoute({
+  component: RootLayout,
+});
+
+function RootLayout() {
+  return (
+    <div className="min-h-screen bg-gray-50">
+      <Outlet />
+    </div>
+  );
+}