[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/eslint.config.mjs

@@ -0,0 +1,28 @@
+import { dirname } from "path";
+import { fileURLToPath } from "url";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+});
+
+const eslintConfig = [
+  ...compat.extends("next/core-web-vitals", "next/typescript"),
+  {
+    rules: {
+      "no-unused-vars": "off",
+      "no-explicit-any": "off",
+      "no-console": "off",
+      "no-debugger": "off",
+      "eqeqeq": "off",
+      "curly": "off",
+      "quotes": "off",
+      "semi": "off",
+    },
+  },
+];
+
+export default eslintConfig;