飞书机器人回复 bug

所有的问题回复都是`Response: \u003e \n\n`
日志如下
```
{"caller":"/GO/ai-stream-bot/main.go:78","level":"info","msg":"UserId: xxxxx , Request: [{\"role\":\"user\",\"content\":\"你是谁？\\"role\":\"assistant\",\"content\":\"\"}] , Response: \u003e \n\n","source":"main.main.func1","time":"2025-07-09 09:20:34.055"}
```