Support Mistral format tools

Former-commit-id: e42d0e54b7a64a3f017a09e99846d174db7b438f

src/llamafactory/webui/chatter.py

@@ -157,7 +157,7 @@ class WebChatModel(ChatModel):
                 result = response
 
             if isinstance(result, list):
-                tool_calls = [{"name": tool[0], "arguments": json.loads(tool[1])} for tool in result]
+                tool_calls = [{"name": tool.name, "arguments": json.loads(tool.arguments)} for tool in result]
                 tool_calls = json.dumps(tool_calls, indent=4, ensure_ascii=False)
                 output_messages = messages + [{"role": Role.FUNCTION.value, "content": tool_calls}]
                 bot_text = "```json\n" + tool_calls + "\n```"