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/app.css

@@ -0,0 +1 @@
+@import "tailwindcss";