fix: chatbot for api self-defined prompt did not work

[fridayL]

Pre-submission checklist | 提交前检查

• I have searched existing issues and this hasn't been mentioned before | 我已搜索现有问题，确认此问题尚未被提及
• I have read the project documentation and confirmed this issue doesn't already exist | 我已阅读项目文档并确认此问题尚未存在
• This issue is specific to MemOS and not a general software issue | 该问题是针对 MemOS 的，而不是一般软件问题

Bug Description | 问题描述

server api chat for self-defined prompt did not work , output contain ref【id】

How to Reproduce | 如何重现

MEMOS_PRODUCT_BASE_PROMPT_CN=""

import requests
import json

url = "http://xxxxxxxxx/product/chat/complete"

payload = json.dumps({
   "user_id": "test-user-lcy",
   "mem_cube_id": "test-user-lcy",
   "query": "who are you ",
   "base_prompt":MEMOS_PRODUCT_BASE_PROMPT_CN
})
headers = {
   'Content-Type': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(json.dumps(response.json(), indent=2, ensure_ascii=False))

Environment | 环境信息

memos latest

Additional Context | 其他信息

No response

Willingness to Implement | 实现意愿

• I'm willing to implement this myself | 我愿意自己解决
• I would like someone else to implement this | 我希望其他人来解决