로그인 AuthProvider 추가

frontend/src/App.tsx

 import React from "react";
-import { BrowserRouter, Route, Routes, Link, Outlet } from "react-router-dom";
+import { BrowserRouter, Route, Routes } from "react-router-dom";
 import "tailwindcss/tailwind.css";
 import { IntoPost } from "./post/intopost";
-import { Login, Signup } from "./auth";
+import { Login, Profile, Signup } from "./auth";
 import { Header, Body } from "./home";
 import { Board } from "./board";
 import Posting from "./post/posting";
+import { Layout } from "./commons";
 
 export const App = () => {
   return (
     <BrowserRouter>
       <Routes>
+        <Route element={<Layout />}>
           <Route path="login" element={<Login />} />
           <Route path="signup" element={<Signup />} />
           <Route path="/" element={<Header />}>
@@ -18,6 +20,8 @@ export const App = () => {
             <Route path="posting" element={<Posting />} />
             <Route path="board" element={<Board />} />
             <Route path="post/:postId" element={<IntoPost />} />
+            <Route path="profile" element={<Profile />} />
+          </Route>
         </Route>
       </Routes>
     </BrowserRouter>

frontend/src/commons/index.tsx

+export { default as Layout } from "./layout";