feat: frontend alumnos sam-pruebas (RUT+clave, rendir y mis resultados)

frontend/app/api/auth/logout/route.ts

@@ -0,0 +1,9 @@
+import { NextResponse } from "next/server";
+
+const COOKIE = "sam_pruebas_alumno";
+
+export async function POST() {
+  const res = NextResponse.json({ success: true });
+  res.cookies.set(COOKIE, "", { httpOnly: true, path: "/", maxAge: 0 });
+  return res;
+}