feat: #1640 support free gpt endpoint

app/api/auth.ts

@@ -2,6 +2,7 @@ import { NextRequest } from "next/server";
 import { getServerSideConfig } from "../config/server";
 import md5 from "spark-md5";
 import { ACCESS_CODE_PREFIX } from "../constant";
+import { OPENAI_URL } from "./common";
 
 function getIP(req: NextRequest) {
   let ip = req.ip ?? req.headers.get("x-real-ip");
@@ -55,7 +56,7 @@ export function auth(req: NextRequest) {
     } else {
       console.log("[Auth] admin did not provide an api key");
       return {
-        error: true,
+        error: serverConfig.baseUrl?.includes(OPENAI_URL),
         msg: "admin did not provide an api key",
       };
     }