인증 api 추가

frontend/src/apis/auth.api.ts

+import axios from "axios";
+import baseUrl from "./baseUrl";
+
+export const login = async (email: string, password: string) => {
+  const { data } = await axios.post(`${baseUrl}/auth/login`, {
+    email,
+    password,
+  });
+  return data;
+};
+
+export const logout = async () => {
+  const { data } = await axios.get(`${baseUrl}/auth/logout`);
+  return data;
+};