[feat] update some feature

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

demo/voice_text_editor/README.md

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+---
+title: Voice Text Editor
+emoji: 📝
+colorFrom: purple
+colorTo: red
+sdk: gradio
+sdk_version: 5.16.0
+app_file: app.py
+pinned: false
+license: mit
+short_description: Edit text documents with your voice!
+tags: [webrtc, websocket, gradio, secret|HF_TOKEN, secret|SAMBANOVA_API_KEY]
+---
+
+# Voice Text Editor
+
+Edit text documents with your voice!
+
+

demo/voice_text_editor/app.py

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+import os
+
+import gradio as gr
+from dotenv import load_dotenv
+from fastrtc import AdditionalOutputs, ReplyOnPause, Stream, get_stt_model
+from openai import OpenAI
+
+load_dotenv()
+
+sambanova_client = OpenAI(
+    api_key=os.getenv("SAMBANOVA_API_KEY"), base_url="https://api.sambanova.ai/v1"
+)
+stt_model = get_stt_model()
+
+
+SYSTEM_PROMPT = """You are an intelligent voice-activated text editor assistant. Your purpose is to help users create and modify text documents through voice commands.
+
+For each interaction:
+1. You will receive the current state of a text document and a voice input from the user.
+2. Determine if the input is:
+   a) A command to modify the document (e.g., "delete the last line", "capitalize that")
+   b) Content to be added to the document (e.g., "buy 12 eggs at the store")
+   c) A modification to existing content (e.g., "actually make that 24" to change "12" to "24")
+3. Return ONLY the new document state after the changes have been applied.
+
+Example:
+
+CURRENT DOCUMENT:
+
+
+Meeting notes:
+- Buy GPUs
+- Meet with Joe
+
+USER INPUT: Make that 100 GPUS
+
+NEW DOCUMENT STATE:
+
+Meeting notes:
+- Buy 100 GPUs
+- Meet with Joe
+
+Example 2:
+
+CURRENT DOCUMENT:
+
+Project Proposal
+
+USER INPUT: Make that a header
+
+NEW DOCUMENT STATE:
+
+# Project Proposal
+
+When handling commands:
+- Apply the requested changes precisely to the document
+- Support operations like adding, deleting, modifying, and moving text
+- Understand contextual references like "that", "the last line", "the second paragraph"
+
+When handling content additions:
+- Add the new text at the appropriate location (usually at the end or cursor position)
+- Format it appropriately based on the document context
+- If the user says to "add" or "insert" do not remove text that was already in the document.
+
+When handling content modifications:
+- Identify what part of the document the user is referring to
+- Apply the requested change while preserving the rest of the content
+- Be smart about contextual references (e.g., "make that 24" should know to replace a number)
+
+NEVER include any text in the new document state that is not part of the user's input.
+NEVER include the phrase "CURRENT DOCUMENT" in the new document state.
+NEVER reword the user's input unless you are explicitly asked to do so.
+"""
+
+
+def edit(audio, current_document: str):
+    prompt = stt_model.stt(audio)
+    print(f"Prompt: {prompt}")
+    response = sambanova_client.chat.completions.create(
+        model="Meta-Llama-3.3-70B-Instruct",
+        messages=[
+            {"role": "system", "content": SYSTEM_PROMPT},
+            {
+                "role": "user",
+                "content": f"CURRENT DOCUMENT:\n\n{current_document}\n\nUSER INPUT: {prompt}",
+            },
+        ],
+        max_tokens=200,
+    )
+    doc = response.choices[0].message.content
+    yield AdditionalOutputs(doc)
+
+
+doc = gr.Textbox(value="", label="Current Document")
+
+
+stream = Stream(
+    ReplyOnPause(edit),
+    modality="audio",
+    mode="send",
+    additional_inputs=[doc],
+    additional_outputs=[doc],
+    additional_outputs_handler=lambda prev, current: current,
+    ui_args={"title": "Voice Text Editor with FastRTC 🗣️"},
+)
+
+if __name__ == "__main__":
+    if (mode := os.getenv("MODE")) == "UI":
+        stream.ui.launch(server_port=7860)
+    elif mode == "PHONE":
+        stream.fastphone(host="0.0.0.0", port=7860)
+    else:
+        stream.ui.launch(server_port=7860)