[feat] update some feature

sync code of  fastrtc,
add text support through datachannel,
fix safari connect problem
support chat without camera or mic

demo/nextjs_voice_chat/frontend/fastrtc-demo/app/page.tsx

@@ -0,0 +1,16 @@
+import { BackgroundCircleProvider } from "@/components/background-circle-provider";
+import { ThemeToggle } from "@/components/ui/theme-toggle";
+import { ResetChat } from "@/components/ui/reset-chat";
+export default function Home() {
+  return (
+    <div className="flex flex-col items-center justify-center h-screen">
+      <BackgroundCircleProvider />
+      <div className="absolute top-4 right-4 z-10">
+        <ThemeToggle />
+      </div>
+      <div className="absolute bottom-4 right-4 z-10">
+        <ResetChat />
+      </div>
+    </div>
+  );
+}