feat:增加存储用户对话记录

utils.py

@@ -0,0 +1,11 @@
+from langchain_core.messages import HumanMessage, AIMessage
+
+
+def dicts_to_messages(messages: list[dict]):
+    result = []
+    for m in messages:
+        if m["role"] == "user":
+            result.append(HumanMessage(content=m["content"]))
+        elif m["role"] == "ai":
+            result.append(AIMessage(content=m["content"]))
+    return result