From fa9413a9307de6add27fdc53437ee1cf4817a32e Mon Sep 17 00:00:00 2001
From: JeongwooSeo <sjw4371@cj.net>
Date: Fri, 11 Sep 2026 14:55:28 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=EA=B2=80=EC=83=89=20=EB=85=B8=EC=B6=9C?=
 =?UTF-8?q?=20=EB=A9=94=ED=83=80=EB=8D=B0=EC=9D=B4=ED=84=B0=20=EC=A0=95?=
 =?UTF-8?q?=EB=B9=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 app/admin/AdminLayoutClient.tsx     | 22 ++++++++++
 app/admin/layout.tsx                | 24 +++++-----
 app/api/portfolio/data.ts           |  2 +-
 app/atelier/layout.tsx              | 10 +++--
 app/entities/common/NavBar.tsx      |  3 +-
 app/layout.tsx                      | 68 ++++++++---------------------
 app/lib/rss.ts                      | 31 ++++++-------
 app/lib/site.ts                     | 14 ++++++
 app/not-found.tsx                   |  7 +++
 app/page.tsx                        | 62 +++++++++++++++++++++++---
 app/portfolio/[slug]/page.tsx       | 14 +++---
 app/portfolio/layout.tsx            | 22 ++++++----
 app/posts/[slug]/page.tsx           | 38 ++++++++++------
 app/robots.ts                       |  6 +--
 app/series/[slug]/layout.tsx        | 31 ++++++++-----
 app/series/[slug]/page.tsx          |  8 +++-
 app/series/layout.tsx               | 17 +++++---
 app/sitemap.ts                      | 12 ++---
 app/subscribe/error/page.tsx        |  2 +
 app/subscribe/unsubscribed/page.tsx |  2 +
 app/subscribe/verified/page.tsx     |  2 +
 app/tags/layout.tsx                 | 17 +++++---
 22 files changed, 263 insertions(+), 151 deletions(-)
 create mode 100644 app/admin/AdminLayoutClient.tsx
 create mode 100644 app/lib/site.ts

diff --git a/app/admin/AdminLayoutClient.tsx b/app/admin/AdminLayoutClient.tsx
new file mode 100644
index 00000000..ddb161d0
--- /dev/null
+++ b/app/admin/AdminLayoutClient.tsx
@@ -0,0 +1,22 @@
+'use client';
+
+import { SessionProvider } from 'next-auth/react';
+import { Suspense } from 'react';
+import ProtectedRoute from '@/app/entities/common/Layout/ProtectedRoute';
+import SVGLoadingSpinner from '@/app/entities/common/Loading/SVGLoadingSpinner';
+
+interface AdminLayoutClientProps {
+  children: React.ReactNode;
+}
+
+const AdminLayoutClient = ({ children }: AdminLayoutClientProps) => {
+  return (
+    <SessionProvider>
+      <ProtectedRoute>
+        <Suspense fallback={<SVGLoadingSpinner />}>{children}</Suspense>
+      </ProtectedRoute>
+    </SessionProvider>
+  );
+};
+
+export default AdminLayoutClient;
diff --git a/app/admin/layout.tsx b/app/admin/layout.tsx
index d3236e2f..8fea74cb 100644
--- a/app/admin/layout.tsx
+++ b/app/admin/layout.tsx
@@ -1,21 +1,21 @@
-'use client';
-import { SessionProvider } from 'next-auth/react';
-import { Suspense } from 'react';
-import ProtectedRoute from '@/app/entities/common/Layout/ProtectedRoute';
-import SVGLoadingSpinner from '@/app/entities/common/Loading/SVGLoadingSpinner';
+import type { Metadata } from 'next';
+import AdminLayoutClient from './AdminLayoutClient';
+
+export const metadata: Metadata = {
+  title: '관리자 | ShipFriend TechBlog',
+  robots: {
+    index: false,
+    follow: false,
+    googleBot: { index: false, follow: false },
+  },
+};
 
 interface AdminPageLayoutProps {
   children: React.ReactNode;
 }
 
 const AdminPageLayout = ({ children }: AdminPageLayoutProps) => {
-  return (
-    <SessionProvider>
-      <ProtectedRoute>
-        <Suspense fallback={<SVGLoadingSpinner />}>{children}</Suspense>
-      </ProtectedRoute>
-    </SessionProvider>
-  );
+  return <AdminLayoutClient>{children}</AdminLayoutClient>;
 };
 
 export default AdminPageLayout;
diff --git a/app/api/portfolio/data.ts b/app/api/portfolio/data.ts
index 4ab18fac..5ff74fc7 100644
--- a/app/api/portfolio/data.ts
+++ b/app/api/portfolio/data.ts
@@ -39,7 +39,7 @@ const shipfriend: PortfolioItem = {
       url: '/posts/%EB%8B%A4%ED%81%AC%EB%AA%A8%EB%93%9C-fouc-%EA%B9%9C%EB%B9%A1%EC%9E%84-%ED%98%84%EC%83%81-%EC%88%98%EC%A0%95%ED%95%98%EA%B8%B0',
     },
   ],
-  mainImage: '/plane.png',
+  mainImage: '/images/projects/shipfriend/main.webp',
   images: [
     '/images/projects/shipfriend/bloglist.webp',
     '/images/projects/shipfriend/blog-detail.webp',
diff --git a/app/atelier/layout.tsx b/app/atelier/layout.tsx
index c7b99e43..63af6423 100644
--- a/app/atelier/layout.tsx
+++ b/app/atelier/layout.tsx
@@ -1,4 +1,5 @@
 import { Metadata } from 'next';
+import { SITE_URL } from '@/app/lib/site';
 import AtelierClientLayout from './AtelierClientLayout';
 
 export const metadata: Metadata = {
@@ -7,12 +8,12 @@ export const metadata: Metadata = {
   openGraph: {
     title: 'Atelier - ShipFriend TechBlog',
     description: '생각들을 던져두는 곳, Atelier 페이지입니다.',
-    url: 'https://shipfriend.dev/atelier',
+    url: `${SITE_URL}/atelier`,
     siteName: 'ShipFriend TechBlog',
     type: 'website',
     images: [
       {
-        url: 'https://shipfriend.dev/images/atelier/atelier-og-thumbnail.webp',
+        url: `${SITE_URL}/images/atelier/atelier-og-thumbnail.webp`,
         width: 1200,
         height: 630,
         alt: 'Atelier',
@@ -23,7 +24,10 @@ export const metadata: Metadata = {
     card: 'summary_large_image',
     title: 'Atelier - ShipFriend TechBlog',
     description: '생각들을 던져두는 곳, Atelier 페이지입니다.',
-    images: ['https://shipfriend.dev/images/atelier/atelier-og-thumbnail.webp'],
+    images: [`${SITE_URL}/images/atelier/atelier-og-thumbnail.webp`],
+  },
+  alternates: {
+    canonical: `${SITE_URL}/atelier`,
   },
 };
 
diff --git a/app/entities/common/NavBar.tsx b/app/entities/common/NavBar.tsx
index fac63314..84322ae5 100644
--- a/app/entities/common/NavBar.tsx
+++ b/app/entities/common/NavBar.tsx
@@ -52,11 +52,12 @@ const NavBar = () => {
         className={`${fixedStyle} fixed h-16 top-0 px-4 w-screen inline-flex items-center justify-center z-40 backdrop-blur-sm`}
       >
         <div>
-          <Link href={'/'}>
+          <Link href={'/'} aria-label="ShipFriend TechBlog 홈">
             <Profile
               profileThumbnail={'/images/profile/profile.jpg'}
               username={'Jeongwoo Seo'}
             />
+            <span className="sr-only">ShipFriend TechBlog</span>
           </Link>
         </div>
         <ul
diff --git a/app/layout.tsx b/app/layout.tsx
index e92f23c6..e8299890 100644
--- a/app/layout.tsx
+++ b/app/layout.tsx
@@ -5,33 +5,38 @@ import React from 'react';
 import Footer from '@/app/entities/common/Footer';
 import NavBar from '@/app/entities/common/NavBar';
 import ToastProvider from '@/app/entities/common/Toast/ToastProvider';
+import {
+  DEFAULT_SOCIAL_IMAGE,
+  SITE_DESCRIPTION,
+  SITE_NAME,
+  SITE_URL,
+} from '@/app/lib/site';
 import { GoogleAnalytics } from '@next/third-parties/google';
 
-const SITE_NAME = 'ShipFriend TechBlog';
-const SITE_DESCRIPTION = '문제 해결 경험과 개발 지식을 공유하는 개발 블로그입니다.';
-const SITE_URL = process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev';
-
 export const metadata: Metadata = {
+  metadataBase: new URL(SITE_URL),
   title: SITE_NAME,
   description: SITE_DESCRIPTION,
+  applicationName: SITE_NAME,
+  authors: [{ name: 'ShipFriend', url: 'https://github.com/ShipFriend0516' }],
+  creator: 'ShipFriend',
+  publisher: SITE_NAME,
   icons: {
-    icon: '/favicon.ico',
-    apple: '/assets/apple-touch-icon.png',
-    shortcut: '/favicon-16.png',
-    other: [
+    icon: [
+      { url: '/favicon.ico' },
       {
-        rel: 'icon',
-        url: '/favicon-32.png',
+        url: '/assets/favicon-32x32.png',
         sizes: '32x32',
         type: 'image/png',
       },
       {
-        rel: 'icon',
-        url: '/favicon-16.png',
+        url: '/assets/favicon-16x16.png',
         sizes: '16x16',
         type: 'image/png',
       },
     ],
+    apple: '/assets/apple-touch-icon.png',
+    shortcut: '/assets/favicon-16x16.png',
   },
   keywords: [
     'ShipFriend',
@@ -51,7 +56,7 @@ export const metadata: Metadata = {
     siteName: SITE_NAME,
     images: [
       {
-        url: `${SITE_URL}/images/profile/profile-banner.png`,
+        url: DEFAULT_SOCIAL_IMAGE,
         width: 1424,
         height: 752,
         alt: 'ShipFriend TechBlog Open Graph Image',
@@ -64,7 +69,7 @@ export const metadata: Metadata = {
     card: 'summary_large_image',
     title: SITE_NAME,
     description: SITE_DESCRIPTION,
-    images: [`${SITE_URL}/images/profile/profile-banner.png`],
+    images: [DEFAULT_SOCIAL_IMAGE],
   },
   alternates: {
     canonical: SITE_URL,
@@ -75,7 +80,6 @@ export const metadata: Metadata = {
     },
   },
   other: {
-    'application-name': 'ShipFriend TechBlog 🌱',
     author: 'ShipFriend',
     'article:tag': 'technology,programming,web development',
   },
@@ -150,34 +154,6 @@ export default function RootLayout({
 }: Readonly<{
   children: React.ReactNode;
 }>) {
-  const siteSchema = {
-    '@context': 'https://schema.org',
-    '@graph': [
-      {
-        '@type': 'WebSite',
-        '@id': `${SITE_URL}/#website`,
-        url: SITE_URL,
-        name: SITE_NAME,
-        description: SITE_DESCRIPTION,
-        inLanguage: 'ko-KR',
-        publisher: {
-          '@id': `${SITE_URL}/#organization`,
-        },
-      },
-      {
-        '@type': 'Organization',
-        '@id': `${SITE_URL}/#organization`,
-        name: SITE_NAME,
-        url: SITE_URL,
-        logo: {
-          '@type': 'ImageObject',
-          url: `${SITE_URL}/assets/apple-touch-icon.png`,
-        },
-        sameAs: ['https://github.com/ShipFriend0516'],
-      },
-    ],
-  };
-
   return (
     <html lang="ko" suppressHydrationWarning>
       <head>
@@ -186,12 +162,6 @@ export default function RootLayout({
             __html: preventFOUC,
           }}
         />
-        <script
-          type="application/ld+json"
-          dangerouslySetInnerHTML={{
-            __html: JSON.stringify(siteSchema),
-          }}
-        />
       </head>
       <body
         className={`${pretendard.variable} font-sans antialiased min-h-screen flex flex-col justify-between`}
diff --git a/app/lib/rss.ts b/app/lib/rss.ts
index 19901d17..bcfd1753 100644
--- a/app/lib/rss.ts
+++ b/app/lib/rss.ts
@@ -1,4 +1,5 @@
 import { Feed } from 'feed';
+import { SITE_DESCRIPTION, SITE_NAME, SITE_URL } from '@/app/lib/site';
 
 export interface FeedPost {
   title: string;
@@ -14,40 +15,34 @@ export interface FeedPost {
  * 요청 시점에 직렬화(feed.rss2()/atom1()/json1())해서 응답합니다.
  */
 export function buildFeed(posts: FeedPost[]) {
-  const site_url =
-    process.env.NEXT_PUBLIC_DEPLOYMENT_URL ||
-    process.env.NEXTAUTH_URL ||
-    'http://localhost:3000';
-
   const feed = new Feed({
-    title: 'ShipFriend TechBlog',
-    description:
-      '개인 개발 블로그로, Nextjs로 개발되었습니다. 개발 관련 글을 작성합니다.',
-    id: site_url,
-    link: site_url,
-    image: `${site_url}/favicon.png`,
-    favicon: `${site_url}/favicon.ico`,
+    title: SITE_NAME,
+    description: SITE_DESCRIPTION,
+    id: `${SITE_URL}/`,
+    link: `${SITE_URL}/`,
+    image: `${SITE_URL}/assets/android-chrome-512x512.png`,
+    favicon: `${SITE_URL}/favicon.ico`,
     copyright: `All rights reserved ${new Date().getFullYear()}`,
     generator: 'Feed for Next.js',
     feedLinks: {
-      rss2: `${site_url}/rss.xml`,
-      json: `${site_url}/feed.json`,
-      atom: `${site_url}/atom.xml`,
+      rss2: `${SITE_URL}/rss.xml`,
+      json: `${SITE_URL}/feed.json`,
+      atom: `${SITE_URL}/atom.xml`,
     },
   });
 
   posts.forEach((post) => {
     feed.addItem({
       title: post.title,
-      id: `${site_url}/posts/${post.slug}`,
-      link: `${site_url}/posts/${post.slug}`,
+      id: `${SITE_URL}/posts/${encodeURIComponent(post.slug)}`,
+      link: `${SITE_URL}/posts/${encodeURIComponent(post.slug)}`,
       description: post.subTitle,
       content: post.content,
       author: [
         {
           name: '개발자 서정우',
           email: 'sjw4371@naver.com',
-          link: site_url,
+          link: `${SITE_URL}/`,
         },
       ],
       date: new Date(post.date),
diff --git a/app/lib/site.ts b/app/lib/site.ts
new file mode 100644
index 00000000..6215e457
--- /dev/null
+++ b/app/lib/site.ts
@@ -0,0 +1,14 @@
+export const SITE_NAME = 'ShipFriend TechBlog';
+export const SITE_DESCRIPTION =
+  '문제 해결 경험과 개발 지식을 공유하는 개발 블로그입니다.';
+
+export const SITE_URL = (
+  process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev'
+).replace(/\/$/, '');
+
+export const DEFAULT_SOCIAL_IMAGE = `${SITE_URL}/images/profile/profile-banner.png`;
+
+export function absoluteUrl(pathOrUrl: string): string {
+  if (/^https?:\/\//i.test(pathOrUrl)) return pathOrUrl;
+  return new URL(pathOrUrl, `${SITE_URL}/`).toString();
+}
diff --git a/app/not-found.tsx b/app/not-found.tsx
index a68a5ba9..79ed29d4 100644
--- a/app/not-found.tsx
+++ b/app/not-found.tsx
@@ -1,5 +1,12 @@
+import type { Metadata } from 'next';
 import LottiePlayer from '@/app/entities/common/Animation/LottiePlayer';
 import notfoundAnimation from '@/app/public/assets/notfound.json';
+
+export const metadata: Metadata = {
+  title: '페이지를 찾을 수 없음 | ShipFriend TechBlog',
+  robots: { index: false, follow: false },
+};
+
 const NotFound = () => {
   return (
     <div className={' relative mx-auto max-w-4xl'}>
diff --git a/app/page.tsx b/app/page.tsx
index ce1f59d3..cf1edd09 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -1,4 +1,10 @@
+import type { Metadata } from 'next';
 import dbConnect from '@/app/lib/dbConnect';
+import {
+  SITE_DESCRIPTION,
+  SITE_NAME,
+  SITE_URL,
+} from '@/app/lib/site';
 import Post from '@/app/models/Post';
 import { Post as PostType } from '@/app/types/Post';
 import AboutMe from './entities/profile/AboutMe';
@@ -7,6 +13,40 @@ import HeroBanner from './entities/profile/HeroBanner';
 import LatestArticles from './entities/profile/LatestArticles';
 import WelcomeClient from './entities/profile/WelcomeClient';
 
+export const metadata: Metadata = {
+  title: SITE_NAME,
+  description: SITE_DESCRIPTION,
+  alternates: { canonical: `${SITE_URL}/` },
+};
+
+const siteSchema = {
+  '@context': 'https://schema.org',
+  '@graph': [
+    {
+      '@type': 'WebSite',
+      '@id': `${SITE_URL}/#website`,
+      url: `${SITE_URL}/`,
+      name: SITE_NAME,
+      alternateName: ['ShipFriend', 'shipfriend.dev'],
+      description: SITE_DESCRIPTION,
+      inLanguage: 'ko-KR',
+      publisher: { '@id': `${SITE_URL}/#organization` },
+    },
+    {
+      '@type': 'Organization',
+      '@id': `${SITE_URL}/#organization`,
+      name: SITE_NAME,
+      alternateName: 'ShipFriend',
+      url: `${SITE_URL}/`,
+      logo: {
+        '@type': 'ImageObject',
+        url: `${SITE_URL}/assets/apple-touch-icon.png`,
+      },
+      sameAs: ['https://github.com/ShipFriend0516'],
+    },
+  ],
+};
+
 const Home = async () => {
   await dbConnect();
   const publicFilter = {
@@ -25,13 +65,21 @@ const Home = async () => {
   const posts = rawPosts as unknown as PostType[];
 
   return (
-    <main className="w-full max-w-5xl mx-auto grid gap-12 p-4 md:p-6">
-      <WelcomeClient />
-      <HeroBanner />
-      <AboutMe />
-      <Experience />
-      <LatestArticles posts={posts} totalCount={totalCount} />
-    </main>
+    <>
+      <script
+        type="application/ld+json"
+        dangerouslySetInnerHTML={{
+          __html: JSON.stringify(siteSchema).replace(/<\//g, '<\\/'),
+        }}
+      />
+      <div className="w-full max-w-5xl mx-auto grid gap-12 p-4 md:p-6">
+        <WelcomeClient />
+        <HeroBanner />
+        <AboutMe />
+        <Experience />
+        <LatestArticles posts={posts} totalCount={totalCount} />
+      </div>
+    </>
   );
 };
 
diff --git a/app/portfolio/[slug]/page.tsx b/app/portfolio/[slug]/page.tsx
index 3fd3b548..52c39b4b 100644
--- a/app/portfolio/[slug]/page.tsx
+++ b/app/portfolio/[slug]/page.tsx
@@ -1,5 +1,6 @@
 import { Metadata } from 'next';
 import { portfolioData } from '@/app/api/portfolio/data';
+import { absoluteUrl, SITE_NAME, SITE_URL } from '@/app/lib/site';
 import PortfolioDetailClient from './PortfolioDetailClient';
 
 interface PortfolioDetailPageProps {
@@ -8,9 +9,6 @@ interface PortfolioDetailPageProps {
   }>;
 }
 
-const baseUrl =
-  process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev';
-
 export async function generateMetadata(props: PortfolioDetailPageProps): Promise<Metadata> {
   const params = await props.params;
   const portfolio = portfolioData[params.slug as keyof typeof portfolioData];
@@ -27,12 +25,12 @@ export async function generateMetadata(props: PortfolioDetailPageProps): Promise
     openGraph: {
       title: `${portfolio.title} | ShipFriend TechBlog`,
       description: portfolio.description,
-      url: `${baseUrl}/portfolio/${params.slug}`,
-      siteName: 'ShipFriend TechBlog',
+      url: `${SITE_URL}/portfolio/${params.slug}`,
+      siteName: SITE_NAME,
       locale: 'ko_KR',
       type: 'website',
       images: portfolio.mainImage
-        ? [{ url: `${baseUrl}${portfolio.mainImage}`, alt: portfolio.title }]
+        ? [{ url: absoluteUrl(portfolio.mainImage), alt: portfolio.title }]
         : undefined,
     },
     twitter: {
@@ -40,11 +38,11 @@ export async function generateMetadata(props: PortfolioDetailPageProps): Promise
       title: `${portfolio.title} | ShipFriend TechBlog`,
       description: portfolio.description,
       images: portfolio.mainImage
-        ? [`${baseUrl}${portfolio.mainImage}`]
+        ? [absoluteUrl(portfolio.mainImage)]
         : undefined,
     },
     alternates: {
-      canonical: `${baseUrl}/portfolio/${params.slug}`,
+      canonical: `${SITE_URL}/portfolio/${params.slug}`,
     },
   };
 }
diff --git a/app/portfolio/layout.tsx b/app/portfolio/layout.tsx
index 76b3c9a8..5bd4b786 100644
--- a/app/portfolio/layout.tsx
+++ b/app/portfolio/layout.tsx
@@ -1,21 +1,27 @@
 import type { Metadata } from 'next';
+import { DEFAULT_SOCIAL_IMAGE, SITE_NAME, SITE_URL } from '@/app/lib/site';
 
 export const metadata: Metadata = {
   title: '포트폴리오 | ShipFriend TechBlog',
   description: 'ShipFriend의 프로젝트 포트폴리오입니다.',
-  robots: {
-    index: false,
-    follow: false,
-  },
+  robots: { index: true, follow: true },
   openGraph: {
     title: '포트폴리오 | ShipFriend TechBlog',
     description: 'ShipFriend의 프로젝트 포트폴리오입니다.',
-    url:
-      (process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev') +
-      '/portfolio',
-    siteName: 'ShipFriend TechBlog',
+    url: `${SITE_URL}/portfolio`,
+    siteName: SITE_NAME,
     locale: 'ko_KR',
     type: 'website',
+    images: [DEFAULT_SOCIAL_IMAGE],
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: '포트폴리오 | ShipFriend TechBlog',
+    description: 'ShipFriend의 프로젝트 포트폴리오입니다.',
+    images: [DEFAULT_SOCIAL_IMAGE],
+  },
+  alternates: {
+    canonical: `${SITE_URL}/portfolio`,
   },
 };
 
diff --git a/app/posts/[slug]/page.tsx b/app/posts/[slug]/page.tsx
index 3cb3779e..21a2aed2 100644
--- a/app/posts/[slug]/page.tsx
+++ b/app/posts/[slug]/page.tsx
@@ -1,5 +1,5 @@
 import { Metadata } from 'next';
-import { permanentRedirect } from 'next/navigation';
+import { notFound, permanentRedirect } from 'next/navigation';
 import Comments from '@/app/entities/comment/Comments';
 import PostActionSection from '@/app/entities/post/detail/PostActionSection';
 import PostBreadcrumbJSONLd from '@/app/entities/post/detail/PostBreadcrumbJSONLd';
@@ -8,15 +8,19 @@ import PostJSONLd from '@/app/entities/post/detail/PostJSONLd';
 import PostRecommendation from '@/app/entities/post/detail/PostRecommendation';
 import SubscribeToast from '@/app/entities/post/detail/SubscribeToast';
 import dbConnect from '@/app/lib/dbConnect';
+import { absoluteUrl, SITE_NAME, SITE_URL } from '@/app/lib/site';
 import { stripMarkdown } from '@/app/lib/utils/stripMarkdown';
 import Post from '@/app/models/Post';
 
 const defaultThumbnail = '/images/placeholder/thumbnail_example2.webp';
+const publicPostFilter = {
+  $or: [{ isPrivate: false }, { isPrivate: { $exists: false } }],
+};
 
 // 정적 생성할 경로 지정 - SSG
 export async function generateStaticParams() {
   await dbConnect();
-  const posts = await Post.find({}, 'slug legacySlug').lean<
+  const posts = await Post.find(publicPostFilter, 'slug legacySlug').lean<
     { slug: string; legacySlug?: string[] }[]
   >();
 
@@ -37,17 +41,20 @@ async function getPostDetail(slug: string) {
   await dbConnect();
   const decoded = decodeURIComponent(slug);
 
-  const post = await Post.findOne({ slug: decoded }).lean();
+  const post = await Post.findOne({
+    slug: decoded,
+    ...publicPostFilter,
+  }).lean();
 
   if (!post) {
     const legacyPost = await Post.findOne(
-      { legacySlug: decoded },
+      { legacySlug: decoded, ...publicPostFilter },
       { slug: 1 }
     ).lean<{ slug: string }>();
     if (legacyPost) {
       permanentRedirect(`/posts/${legacyPost.slug}`);
     }
-    throw new Error('Post not found');
+    notFound();
   }
 
   return { post: JSON.parse(JSON.stringify(post)) };
@@ -60,12 +67,11 @@ export const generateMetadata = async (
 ): Promise<Metadata> => {
   const params = await props.params;
   const { post } = await getPostDetail(params.slug);
-  const baseUrl =
-    process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev';
-  const postUrl = `${baseUrl}/posts/${post.slug}`;
+  const postUrl = `${SITE_URL}/posts/${encodeURIComponent(post.slug)}`;
   const description = post.subTitle
     ? stripMarkdown(post.subTitle, 160)
     : stripMarkdown(post.content, 160);
+  const imageUrl = absoluteUrl(post.thumbnailImage || defaultThumbnail);
 
   return {
     title: post.title,
@@ -78,22 +84,26 @@ export const generateMetadata = async (
       title: post.title,
       description,
       url: postUrl,
-      images: [post.thumbnailImage || defaultThumbnail],
+      siteName: SITE_NAME,
+      images: [imageUrl],
       type: 'article',
       locale: 'ko_KR',
       publishedTime: new Date(post.date).toISOString(),
+      modifiedTime: new Date(post.updatedAt || post.date).toISOString(),
       authors: [post.author],
+      tags: post.tags,
+    },
+    twitter: {
+      card: 'summary_large_image',
+      title: post.title,
+      description,
+      images: [imageUrl],
     },
     other: {
-      'application-name': 'ShipFriend TechBlog',
       author: post.author,
       publish_date: new Date(post.date).toISOString(),
       'article:tag':
         post.tags?.join(',') || 'technology,programming,web development',
-      'twitter:card': 'summary_large_image',
-      'twitter:title': post.title,
-      'twitter:description': description,
-      'twitter:image': String(post.thumbnailImage || defaultThumbnail),
     },
   };
 };
diff --git a/app/robots.ts b/app/robots.ts
index 56cc8deb..51030b9e 100644
--- a/app/robots.ts
+++ b/app/robots.ts
@@ -1,13 +1,13 @@
 // app/robots.ts
 import { MetadataRoute } from 'next';
+import { SITE_URL } from '@/app/lib/site';
 
 export default function robots(): MetadataRoute.Robots {
-  const baseURL = process.env.NEXT_PUBLIC_DEPLOYMENT_URL || process.env.NEXTAUTH_URL || 'http://localhost:3000';
   return {
     rules: {
       userAgent: '*',
-      disallow: ['/admin/', '/private/', '/api/'],
+      disallow: ['/admin', '/private', '/api'],
     },
-    sitemap: [`${baseURL}/sitemap.xml`, `${baseURL}/rss.xml`],
+    sitemap: [`${SITE_URL}/sitemap.xml`, `${SITE_URL}/rss.xml`],
   };
 }
diff --git a/app/series/[slug]/layout.tsx b/app/series/[slug]/layout.tsx
index ff186061..f38cbd98 100644
--- a/app/series/[slug]/layout.tsx
+++ b/app/series/[slug]/layout.tsx
@@ -1,5 +1,11 @@
 import type { Metadata } from 'next';
 import dbConnect from '@/app/lib/dbConnect';
+import {
+  absoluteUrl,
+  DEFAULT_SOCIAL_IMAGE,
+  SITE_NAME,
+  SITE_URL,
+} from '@/app/lib/site';
 import SeriesModel from '@/app/models/Series';
 import { Series } from '@/app/types/Series';
 
@@ -14,9 +20,6 @@ export async function generateMetadata(
   }
 ): Promise<Metadata> {
   const params = await props.params;
-  const baseUrl =
-    process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev';
-
   try {
     await dbConnect();
     const slug = decodeURIComponent(params.slug);
@@ -35,15 +38,15 @@ export async function generateMetadata(
     const description =
       series.description ||
       `${series.title} 시리즈의 글 목록입니다. ShipFriend TechBlog에서 연재되는 시리즈입니다.`;
-    const url = `${baseUrl}/series/${params.slug}`;
+    const url = `${SITE_URL}/series/${encodeURIComponent(series.slug)}`;
 
     const images = series.thumbnailImage
-      ? [{ url: series.thumbnailImage, alt: series.title }]
+      ? [{ url: absoluteUrl(series.thumbnailImage), alt: series.title }]
       : [
           {
-            url: `${baseUrl}/images/profile/profile-banner.png`,
-            width: 512,
-            height: 512,
+            url: DEFAULT_SOCIAL_IMAGE,
+            width: 1424,
+            height: 752,
             alt: 'ShipFriend TechBlog',
           },
         ];
@@ -62,16 +65,22 @@ export async function generateMetadata(
         title,
         description,
         url,
-        siteName: 'ShipFriend TechBlog',
+        siteName: SITE_NAME,
         images,
         locale: 'ko_KR',
         type: 'website',
       },
+      twitter: {
+        card: 'summary_large_image',
+        title,
+        description,
+        images: images.map((image) => image.url),
+      },
       alternates: {
-        canonical: `/series/${params.slug}`,
+        canonical: url,
       },
     };
-  } catch (error) {
+  } catch {
     return {
       title: '시리즈 | ShipFriend TechBlog',
       description: '시리즈 글 목록입니다.',
diff --git a/app/series/[slug]/page.tsx b/app/series/[slug]/page.tsx
index 3d0cbbfe..93af39bf 100644
--- a/app/series/[slug]/page.tsx
+++ b/app/series/[slug]/page.tsx
@@ -42,7 +42,13 @@ const SeriesDetailPage = async (props: SeriesDetailPageProps) => {
   }
 
   const raw = await Series.findOne({ slug })
-    .populate({ path: 'posts', options: { sort: { date: 1 } } })
+    .populate({
+      path: 'posts',
+      match: {
+        $or: [{ isPrivate: false }, { isPrivate: { $exists: false } }],
+      },
+      options: { sort: { date: 1 } },
+    })
     .lean();
 
   if (!raw) notFound();
diff --git a/app/series/layout.tsx b/app/series/layout.tsx
index f040d73e..89cf0aed 100644
--- a/app/series/layout.tsx
+++ b/app/series/layout.tsx
@@ -1,4 +1,5 @@
 import type { Metadata } from 'next';
+import { DEFAULT_SOCIAL_IMAGE, SITE_NAME, SITE_URL } from '@/app/lib/site';
 
 export const metadata: Metadata = {
   title: '시리즈 | ShipFriend TechBlog',
@@ -15,15 +16,21 @@ export const metadata: Metadata = {
     title: '시리즈 | ShipFriend TechBlog',
     description:
       '주제별로 정리된 시리즈 글 목록입니다. 관심 있는 시리즈를 선택해 순서대로 읽어보세요.',
-    url:
-      (process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev') +
-      '/series',
-    siteName: 'ShipFriend TechBlog',
+    url: `${SITE_URL}/series`,
+    siteName: SITE_NAME,
     locale: 'ko_KR',
     type: 'website',
+    images: [DEFAULT_SOCIAL_IMAGE],
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: '시리즈 | ShipFriend TechBlog',
+    description:
+      '주제별로 정리된 시리즈 글 목록입니다. 관심 있는 시리즈를 선택해 순서대로 읽어보세요.',
+    images: [DEFAULT_SOCIAL_IMAGE],
   },
   alternates: {
-    canonical: '/series',
+    canonical: `${SITE_URL}/series`,
   },
 };
 
diff --git a/app/sitemap.ts b/app/sitemap.ts
index 5db26e29..c7a2ad06 100644
--- a/app/sitemap.ts
+++ b/app/sitemap.ts
@@ -1,5 +1,6 @@
 import { MetadataRoute } from 'next';
 import dbConnect from '@/app/lib/dbConnect';
+import { SITE_URL } from '@/app/lib/site';
 import Post from '@/app/models/Post';
 import Series from '@/app/models/Series';
 
@@ -15,10 +16,7 @@ function maxDateString(dates: (Date | string | undefined)[]): string {
 }
 
 export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
-  const baseUrl =
-    process.env.NEXT_PUBLIC_DEPLOYMENT_URL ||
-    process.env.NEXTAUTH_URL ||
-    'http://localhost:3000';
+  const baseUrl = SITE_URL;
 
   if (!process.env.DB_URI) {
     console.error('Database URI is not defined');
@@ -28,7 +26,11 @@ export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
   await dbConnect(process.env.DB_URI);
 
   // 포스트 URL 생성
-  const posts = await Post.find({}).sort({ updatedAt: -1 }).lean();
+  const posts = await Post.find({
+    $or: [{ isPrivate: false }, { isPrivate: { $exists: false } }],
+  })
+    .sort({ updatedAt: -1 })
+    .lean();
   const postsLastmod = posts.length
     ? maxDateString(posts.map((p) => p.updatedAt || p.date))
     : toDateString(new Date());
diff --git a/app/subscribe/error/page.tsx b/app/subscribe/error/page.tsx
index 5cf5bbd7..33c40662 100644
--- a/app/subscribe/error/page.tsx
+++ b/app/subscribe/error/page.tsx
@@ -1,8 +1,10 @@
 import { Metadata } from 'next';
 import Link from 'next/link';
+import { SITE_URL } from '@/app/lib/site';
 
 export const metadata: Metadata = {
   robots: { index: false, follow: false },
+  alternates: { canonical: `${SITE_URL}/subscribe/error` },
 };
 
 const errorMessages: Record<string, string> = {
diff --git a/app/subscribe/unsubscribed/page.tsx b/app/subscribe/unsubscribed/page.tsx
index 3d57f1a6..2fe78a9d 100644
--- a/app/subscribe/unsubscribed/page.tsx
+++ b/app/subscribe/unsubscribed/page.tsx
@@ -1,8 +1,10 @@
 import { Metadata } from 'next';
 import Link from 'next/link';
+import { SITE_URL } from '@/app/lib/site';
 
 export const metadata: Metadata = {
   robots: { index: false, follow: false },
+  alternates: { canonical: `${SITE_URL}/subscribe/unsubscribed` },
 };
 
 export default async function UnsubscribedPage(
diff --git a/app/subscribe/verified/page.tsx b/app/subscribe/verified/page.tsx
index af17a1b7..4987e6fd 100644
--- a/app/subscribe/verified/page.tsx
+++ b/app/subscribe/verified/page.tsx
@@ -1,8 +1,10 @@
 import { Metadata } from 'next';
 import Link from 'next/link';
+import { SITE_URL } from '@/app/lib/site';
 
 export const metadata: Metadata = {
   robots: { index: false, follow: false },
+  alternates: { canonical: `${SITE_URL}/subscribe/verified` },
 };
 
 export default async function VerifiedPage(
diff --git a/app/tags/layout.tsx b/app/tags/layout.tsx
index fb63332c..34adf46e 100644
--- a/app/tags/layout.tsx
+++ b/app/tags/layout.tsx
@@ -1,6 +1,5 @@
 import type { Metadata } from 'next';
-
-const BASE_URL = process.env.NEXT_PUBLIC_DEPLOYMENT_URL || 'https://shipfriend.dev';
+import { DEFAULT_SOCIAL_IMAGE, SITE_NAME, SITE_URL } from '@/app/lib/site';
 
 export const metadata: Metadata = {
   title: '태그 | ShipFriend TechBlog',
@@ -20,13 +19,21 @@ export const metadata: Metadata = {
     title: '태그 | ShipFriend TechBlog',
     description:
       'ShipFriend TechBlog의 태그 목록 페이지입니다. React, TypeScript, Next.js 등 개발 주제별 글을 탐색해보세요.',
-    url: `${BASE_URL}/tags`,
-    siteName: 'ShipFriend TechBlog',
+    url: `${SITE_URL}/tags`,
+    siteName: SITE_NAME,
     locale: 'ko_KR',
     type: 'website',
+    images: [DEFAULT_SOCIAL_IMAGE],
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: '태그 | ShipFriend TechBlog',
+    description:
+      'ShipFriend TechBlog의 태그 목록 페이지입니다. React, TypeScript, Next.js 등 개발 주제별 글을 탐색해보세요.',
+    images: [DEFAULT_SOCIAL_IMAGE],
   },
   alternates: {
-    canonical: `${BASE_URL}/tags`,
+    canonical: `${SITE_URL}/tags`,
   },
 };