fix: 어드민 로그아웃 세션 정리

apps/admin/src/app/auth/login/page.tsx

@@ -11,6 +11,12 @@ export default function AuthLoginPage() {
 		let isMounted = true;
 
 		const redirectIfAuthenticated = async () => {
+			const shouldSkipSessionCheck = new URLSearchParams(window.location.search).get("loggedOut") === "1";
+			if (shouldSkipSessionCheck) {
+				setCanRenderLogin(true);
+				return;
+			}
+
 			try {
 				const token = await ensureSessionToken();
 				if (!isMounted) return;

apps/admin/src/components/layout/AdminLayout.tsx

@@ -1,5 +1,9 @@
+"use client";
+
 import { LogOut } from "lucide-react";
+import { useState } from "react";
 import { toast } from "sonner";
+import { adminSignOutApi } from "@/lib/api/auth";
 import { clearSession } from "@/lib/auth/session";
 import { type ActiveAdminMenu, AdminSidebar } from "./AdminSidebar";
 
@@ -11,10 +15,26 @@ interface AdminLayoutProps {
 }
 
 export function AdminLayout({ children, activeMenu, title, description }: AdminLayoutProps) {
-	const handleLogout = () => {
-		clearSession();
-		toast.success("로그아웃되었습니다.");
-		window.location.assign("/auth/login");
+	const [isLoggingOut, setIsLoggingOut] = useState(false);
+
+	const handleLogout = async () => {
+		if (isLoggingOut) {
+			return;
+		}
+
+		setIsLoggingOut(true);
+
+		try {
+			await adminSignOutApi();
+			toast.success("로그아웃되었습니다.");
+		} catch {
+			toast.error("서버 로그아웃 요청에 실패했습니다.", {
+				description: "로컬 세션을 정리하고 로그인 화면으로 이동합니다.",
+			});
+		} finally {
+			clearSession();
+			window.location.assign("/auth/login?loggedOut=1");
+		}
 	};
 
 	return (
@@ -35,10 +55,11 @@ export function AdminLayout({ children, activeMenu, title, description }: AdminL
 						<button
 							type="button"
 							onClick={handleLogout}
-							className="inline-flex items-center gap-1 rounded-md border border-k-200 px-3 py-1.5 text-k-700 typo-medium-4 hover:bg-k-50"
+							disabled={isLoggingOut}
+							className="inline-flex items-center gap-1 rounded-md border border-k-200 px-3 py-1.5 text-k-700 typo-medium-4 hover:bg-k-50 disabled:cursor-not-allowed disabled:opacity-60"
 						>
 							<LogOut className="h-4 w-4" />
-							로그아웃
+							{isLoggingOut ? "로그아웃 중..." : "로그아웃"}
 						</button>
 					</div>
 				</header>

apps/admin/src/lib/api/auth.ts

@@ -1,4 +1,5 @@
 import axios, { type AxiosResponse } from "axios";
+import { loadAccessToken } from "@/lib/utils/localStorage";
 import type { AdminSignInResponse, ReissueAccessTokenResponse } from "@/types/auth";
 
 const API_SERVER_URL = import.meta.env.VITE_API_SERVER_URL?.trim();
@@ -17,3 +18,11 @@ export const adminSignInApi = (email: string, password: string): Promise<AxiosRe
 
 export const reissueAccessTokenApi = (): Promise<AxiosResponse<ReissueAccessTokenResponse>> =>
 	authAxiosInstance.post("/auth/reissue");
+
+export const adminSignOutApi = (): Promise<AxiosResponse<void>> => {
+	const accessToken = loadAccessToken();
+
+	return authAxiosInstance.post("/auth/sign-out", undefined, {
+		headers: accessToken ? { Authorization: `Bearer ${accessToken}` } : undefined,
+	});
+};

apps/admin/src/lib/auth/session.ts

@@ -3,6 +3,7 @@ import { isTokenExpired } from "@/lib/utils/jwtUtils";
 import { loadAccessToken, removeAccessToken, saveAccessToken } from "@/lib/utils/localStorage";
 
 let reissuePromise: Promise<string | null> | null = null;
+let sessionVersion = 0;
 
 const getValidAccessToken = (): string | null => {
 	const accessToken = loadAccessToken();
@@ -19,6 +20,8 @@ const getValidAccessToken = (): string | null => {
 };
 
 export const clearSession = () => {
+	sessionVersion += 1;
+	reissuePromise = null;
 	removeAccessToken();
 };
 
@@ -27,11 +30,17 @@ export const reissueAccessTokenIfPossible = async (): Promise<string | null> =>
 		return reissuePromise;
 	}
 
+	const reissueSessionVersion = sessionVersion;
+
 	reissuePromise = (async () => {
 		try {
 			const response = await reissueAccessTokenApi();
 			const nextAccessToken = response.data.accessToken;
 
+			if (reissueSessionVersion !== sessionVersion) {
+				return null;
+			}
+
 			if (!nextAccessToken) {
 				clearSession();
 				return null;