i18n(ko-KR): update google-firebase.mdx (withastro#8140)

src/content/docs/ko/guides/backend/google-firebase.mdx

@@ -219,14 +219,18 @@ export const GET: APIRoute = async ({ request, cookies, redirect }) => {
     expiresIn: fiveDays,
   });
 
-  cookies.set("session", sessionCookie, {
+  cookies.set("__session", sessionCookie, {
     path: "/",
   });
 
   return redirect("/dashboard");
 };
 ```
 
+:::caution
+Firebase에서는 [쿠키 1개만 사용할 수 있으며 이름은 `__session`으로 지정해야 합니다](https://firebase.google.com/docs/hosting/manage-cache#using_cookies). 클라이언트가 보내는 다른 쿠키는 애플리케이션에 표시되지 않습니다.
+:::
+
 :::note
 이는 로그인 엔드포인트의 기본 구현입니다. 필요에 따라 이 엔드포인트에 논리를 더 추가할 수 있습니다.
 :::
@@ -237,7 +241,7 @@ export const GET: APIRoute = async ({ request, cookies, redirect }) => {
 import type { APIRoute } from "astro";
 
 export const GET: APIRoute = async ({ redirect, cookies }) => {
-  cookies.delete("session", {
+  cookies.delete("__session", {
     path: "/",
   });
   return redirect("/signin");
@@ -355,8 +359,8 @@ import Layout from "../layouts/Layout.astro";
 
 /* 사용자가 인증되었는지 확인 */
 const auth = getAuth(app);
-if (Astro.cookies.has("session")) {
-  const sessionCookie = Astro.cookies.get("session").value;
+if (Astro.cookies.has("__session")) {
+  const sessionCookie = Astro.cookies.get("__session").value;
   const decodedCookie = await auth.verifySessionCookie(sessionCookie);
   if (decodedCookie) {
     return Astro.redirect("/dashboard");
@@ -432,10 +436,10 @@ import Layout from "../layouts/Layout.astro";
 const auth = getAuth(app);
 
 /* 현재 세션 확인 */
-if (!Astro.cookies.has("session")) {
+if (!Astro.cookies.has("__session")) {
   return Astro.redirect("/signin");
 }
-const sessionCookie = Astro.cookies.get("session").value;
+const sessionCookie = Astro.cookies.get("__session").value;
 const decodedCookie = await auth.verifySessionCookie(sessionCookie);
 const user = await auth.getUser(decodedCookie.uid);
 
@@ -473,8 +477,8 @@ import Layout from "../layouts/Layout.astro";
 
 /* 사용자가 인증되었는지 확인 */
 const auth = getAuth(app);
-if (Astro.cookies.has("session")) {
-  const sessionCookie = Astro.cookies.get("session").value;
+if (Astro.cookies.has("__session")) {
+  const sessionCookie = Astro.cookies.get("__session").value;
   const decodedCookie = await auth.verifySessionCookie(sessionCookie);
   if (decodedCookie) {
     return Astro.redirect("/dashboard");