feat: 增加 ChatGPTUnofficialProxyAPI 的模型自定义配置 (#632)

* feat: 增加 ChatGPTUnofficialProxyAPI 的模型自定义配置(#618)

* perf: 修改判断

---------

Co-authored-by: ChenZhaoYu <790348264@qq.com>

service/src/chatgpt/index.ts

@@ -67,10 +67,13 @@ let api: ChatGPTAPI | ChatGPTUnofficialProxyAPI
     apiModel = 'ChatGPTAPI'
   }
   else {
+    const OPENAI_API_MODEL = process.env.OPENAI_API_MODEL
     const options: ChatGPTUnofficialProxyAPIOptions = {
       accessToken: process.env.OPENAI_ACCESS_TOKEN,
       debug: true,
     }
+    if (isNotEmptyString(OPENAI_API_MODEL))
+      options.model = OPENAI_API_MODEL
 
     if (isNotEmptyString(process.env.API_REVERSE_PROXY))
       options.apiReverseProxyUrl = process.env.API_REVERSE_PROXY