response_format 指定 JSON Schema，模型会严格按结构返回，便于程序直接解析。
curl https://tokendog.io/v1/chat/completions \
-H "Authorization: Bearer $TOKENDOG_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model":"gpt-5",
"messages":[{"role":"user","content":"提取：张三，28岁"}],
"response_format":{"type":"json_schema","json_schema":{
"name":"person","schema":{"type":"object",
"properties":{"name":{"type":"string"},"age":{"type":"integer"}},
"required":["name","age"],"additionalProperties":false}}}
}'
返回内容为符合 schema 的 JSON 字符串，可直接用
JSON.parse / json.loads 解析。