fix: react compiler is not experimental now

I also removed an unused "turbopackPersistentCaching"
which is renamed in Next.js 15.6 (see vercel/next.js#84215).

Author: pan93412

next.config.ts

@@ -3,14 +3,13 @@ import type { NextConfig } from "next";
 const nextConfig: NextConfig = {
   /* config options here */
   reactStrictMode: true,
+  reactCompiler: true,
   experimental: {
-    reactCompiler: true,
     viewTransition: true,
     swcPlugins: [
       ["@swc-contrib/plugin-graphql-codegen-client-preset", { artifactDirectory: "./gql", gqlTagName: "graphql" }],
     ],
     ppr: "incremental",
-    turbopackPersistentCaching: true,
     authInterrupts: true,
   },
 };