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export async function authMiddleware(req: NextRequest) {
  const token = req.headers.get("authorization")?.split("Bearer ")[1];
  if (!token) {
    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
  }
  const decoded = await verifyFirebaseToken(token);
  req.headers.set("x-user-id", decoded.uid);
  return NextResponse.next();
}