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/middleware.ts

@@ -1,39 +0,0 @@
-import { NextRequest, NextResponse } from "next/server";
-import { getSessionCookie } from "better-auth/cookies";
-
-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) {
-  const { pathname } = request.nextUrl;
-
-  // Allow public routes and static assets
-  if (
-    PUBLIC_ROUTES.some((route) => pathname.startsWith(route)) ||
-    pathname.startsWith("/_next") ||
-    pathname.startsWith("/favicon")
-  ) {
-    return NextResponse.next();
-  }
-
-  const sessionCookie = getSessionCookie(request);
-
-  if (!sessionCookie) {
-    return NextResponse.redirect(new URL("/login", request.url));
-  }
-
-  return NextResponse.next();
-}
-
-export const config = {
-  matcher: ["/((?!_next/static|_next/image|favicon.ico).*)"],
-};