feat: support static website

frontend/src/app/workspace/page.tsx

@@ -1,5 +1,20 @@
+import fs from "fs";
+import path from "path";
+
 import { redirect } from "next/navigation";
 
+import { env } from "@/env";
+
 export default function WorkspacePage() {
+  if (env.NEXT_PUBLIC_STATIC_WEBSITE_ONLY === "true") {
+    const firstThread = fs
+      .readdirSync(path.resolve(process.cwd(), "public/demo/threads"), {
+        withFileTypes: true,
+      })
+      .find((thread) => thread.isDirectory() && !thread.name.startsWith("."));
+    if (firstThread) {
+      return redirect(`/workspace/chats/${firstThread.name}`);
+    }
+  }
   return redirect("/workspace/chats/new");
 }