[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/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "fastrtc-demo",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev --turbopack",
+    "build": "next build --no-lint",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "framer-motion": "^12.4.10",
+    "lucide-react": "^0.477.0",
+    "next": "15.2.2-canary.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "tailwind-merge": "^3.0.2",
+    "tailwindcss-animate": "^1.0.7"
+  },
+  "devDependencies": {
+    "@eslint/eslintrc": "^3",
+    "@tailwindcss/postcss": "^4",
+    "@types/node": "^20",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "eslint": "^9",
+    "eslint-config-next": "15.2.2-canary.1",
+    "tailwindcss": "^4",
+    "typescript": "^5"
+  }
+}