add official api, remove davinci, organize root dir

app/chatgpt-browser.js

@@ -0,0 +1,32 @@
+require('dotenv').config();
+const { KeyvFile } = require('keyv-file');
+
+const clientOptions = {
+  // Warning: This will expose your access token to a third party. Consider the risks before using this.
+  reverseProxyUrl: 'https://chatgpt.duti.tech/api/conversation',
+  // Access token from https://chat.openai.com/api/auth/session
+  accessToken: process.env.CHATGPT_TOKEN
+};
+
+const browserClient = async ({ text, progressCallback, convo }) => {
+  const { ChatGPTBrowserClient } = await import('@waylaidwanderer/chatgpt-api');
+
+  const store = {
+    store: new KeyvFile({ filename: './data/cache.json' })
+  };
+
+  const client = new ChatGPTBrowserClient(clientOptions, store);
+
+  let options = {
+    onProgress: async (partialRes) => await progressCallback(partialRes)
+  };
+
+  if (!!convo.parentMessageId && !!convo.conversationId) {
+    options = { ...options, ...convo };
+  }
+
+  const res = await client.sendMessage(text, options);
+  return res;
+};
+
+module.exports = { browserClient };