feat: initial project setup for Meme Studio

Next.js 14 App Router application for managing homophone pun game levels:

- Better Auth with Prisma adapter for authentication
- MySQL database with Prisma ORM
- Level CRUD operations with drag-and-drop reordering
- Tencent COS integration for image uploads
- shadcn/ui components with Tailwind CSS
- TanStack Query for server state management

app/api/auth/[...all]/route.ts

@@ -0,0 +1,4 @@
+import { auth } from '@/lib/auth'
+import { toNextJsHandler } from 'better-auth/next-js'
+
+export const { GET, POST } = toNextJsHandler(auth)