Update app.py

app.py

@@ -1,3 +1,4 @@
+```python
 import os
 import sys
 import json
@@ -9,7 +10,7 @@ from typing import List, Dict, Optional, Tuple
 from enum import Enum
 
 from fastapi import FastAPI, HTTPException
-from，快api.responses import StreamingResponse
+from fastapi.responses import StreamingResponse
 from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel
 import asyncio
@@ -23,7 +24,7 @@ logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(
 logger = logging.getLogger("TxAgentAPI")
 
 # App
-app = FastAPI(title="TxAgent API", version="2.2.1")  # Version bump for hash-based analysis
+app = FastAPI(title="TxAgent API", version="2.2.1")  # Version for hash-based analysis
 
 app.add_middleware(
     CORSMiddleware,
@@ -340,4 +341,4 @@ async def chat_stream_endpoint(request: ChatRequest):
             logger.error(f"Streaming error: {e}")
             yield f"⚠️ Error: {e}"
 
-    return StreamingResponse(token_stream(), media_type="text/plain")
+    return StreamingResponse(token_stream(), media_type="text/plain")