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

components/ui/spinner.tsx

@@ -0,0 +1,44 @@
+'use client'
+
+import * as React from 'react'
+import { cn } from '@/lib/utils'
+
+interface SpinnerProps extends React.HTMLAttributes<HTMLDivElement> {
+  size?: 'sm' | 'md' | 'lg'
+}
+
+export function Spinner({ className, size = 'md', ...props }: SpinnerProps) {
+  const sizeClasses = {
+    sm: 'h-4 w-4',
+    md: 'h-6 w-6',
+    lg: 'h-8 w-8',
+  }
+
+  return (
+    <div
+      className={cn('animate-spin', sizeClasses[size], className)}
+      {...props}
+    >
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        fill="none"
+        viewBox="0 0 24 24"
+        className="w-full h-full"
+      >
+        <circle
+          className="opacity-25"
+          cx="12"
+          cy="12"
+          r="10"
+          stroke="currentColor"
+          strokeWidth="4"
+        />
+        <path
+          className="opacity-75"
+          fill="currentColor"
+          d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
+        />
+      </svg>
+    </div>
+  )
+}