Update app_langgraph.py

app_langgraph.py

@@ -37,7 +37,7 @@ def build_graph():
     llm = ChatOpenAI(
         api_key=dashscope_key,
         base_url="https://coding.dashscope.aliyuncs.com/v1",  # ⚠️ 关键：DashScope 兼容地址
-        model="qwen3-coder-plus",  # 支持 qwen-plus, qwen-max, qwen-turbo 等
+        model="qwen3.5-plus",  # 支持 qwen-plus, qwen-max, qwen-turbo 等
         temperature=0.1,
         verbose=True
     )