fix: change `fetchData` using `conncetor`

src/pages/signup-page/SignupPage.tsx

 import React, { useState } from "react";
 import { useNavigate } from "react-router-dom";
 
-
-
 import APP_ROUTE from "../../_app/config/route";
 
 import S from './SignupPage.module.css';
@@ -10,11 +8,6 @@ import S from './SignupPage.module.css';
 import type Connector from "../../common/instances/Connector";
 
 
-interface passString {
-    origin : string
-    again : string
-}
-
 interface Props {
     connector: Connector;
 }
@@ -90,7 +83,7 @@ const SignupPage: React.FC<Props> = ({ connector }) => {
         ){
             try {
                 void(async () => {
-                    await fetchData('/user/register', FETCH_METHOD.POST, accountData);
+                    await connector.post('/user/register', accountData);
                     navigate(APP_ROUTE.LOGIN);
                 })();
             } catch (e) {