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/levels/reorder/route.ts

@@ -0,0 +1,44 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { prisma } from '@/lib/prisma'
+import { auth } from '@/lib/auth'
+
+// PUT /api/levels/reorder - Batch update sort order
+export async function PUT(request: NextRequest) {
+  try {
+    const session = await auth.api.getSession({
+      headers: request.headers,
+    })
+
+    if (!session) {
+      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+    }
+
+    const body = await request.json()
+    const { orders } = body as { orders: { id: string; sortOrder: number }[] }
+
+    if (!Array.isArray(orders)) {
+      return NextResponse.json(
+        { error: 'orders must be an array' },
+        { status: 400 }
+      )
+    }
+
+    // Update each level's sort order in a transaction
+    await prisma.$transaction(
+      orders.map((item) =>
+        prisma.level.update({
+          where: { id: item.id },
+          data: { sortOrder: item.sortOrder },
+        })
+      )
+    )
+
+    return NextResponse.json({ success: true })
+  } catch (error) {
+    console.error('Error reordering levels:', error)
+    return NextResponse.json(
+      { error: 'Failed to reorder levels' },
+      { status: 500 }
+    )
+  }
+}