Fix build errors for Next.js 16 + Prisma 7

- Fix Prisma import: use @/generated/prisma alias (resolves Turbopack issue)
- Replace middleware.ts with proxy.ts (Next.js 16 convention)
- middleware function renamed to proxy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/prisma.ts

@@ -1,4 +1,4 @@
-import { PrismaClient } from "../generated/prisma";
+import { PrismaClient } from "@/generated/prisma";
 
 const globalForPrisma = globalThis as unknown as {
   prisma: PrismaClient | undefined;

src/proxy.ts

@@ -1,22 +1,11 @@
 import { NextRequest, NextResponse } from "next/server";
 import { getSessionCookie } from "better-auth/cookies";
 
-const PUBLIC_ROUTES = [
-  "/login",
-  "/register",
-  "/verify-email",
-  "/api/auth",
-];
+const PUBLIC_ROUTES = ["/login", "/register", "/verify-email", "/api/auth"];
 
-const ROLE_ROUTES: Record<string, string[]> = {
-  admin: ["/admin"],
-  curator: ["/curator", "/admin"],
-};
-
-export async function middleware(request: NextRequest) {
+export function proxy(request: NextRequest) {
   const { pathname } = request.nextUrl;
 
-  // Allow public routes and static assets
   if (
     PUBLIC_ROUTES.some((route) => pathname.startsWith(route)) ||
     pathname.startsWith("/_next") ||