v1.4.5: 게시물 작성자·편집 링크·목록 요약 보정

- posts.author_id 마이그레이션 및 owner/admin 단일 계정 환경에서만 기존 글 backfill
- 공개 상세: 글쓴이 본인일 때만 공유 옆 수정 링크 표시, 수정 시각 제거
- 목록 요약: excerpt 없을 때 본문 fallback, post-summary-clamp로 말줄임 처리
- 회원 세션 API에 isAdmin·role 추가

server/routes/admin/api/posts.post.js

@@ -9,7 +9,7 @@ import { createAdminPost } from '../../../repositories/content-repository'
  * @returns {Promise<Object>} 생성된 게시물
  */
 export default defineEventHandler(async (event) => {
-  requireAdminSession(event)
+  const adminSession = requireAdminSession(event)
 
   const parsedBody = parseAdminPostInput(await readBody(event))
 
@@ -21,7 +21,7 @@ export default defineEventHandler(async (event) => {
   }
 
   try {
-    return await createAdminPost(parsedBody.data)
+    return await createAdminPost(parsedBody.data, adminSession.userId)
   } catch (error) {
     if (error?.code === '23505') {
       throw createError({

server/routes/admin/api/posts/[id].put.js

@@ -9,7 +9,7 @@ import { updateAdminPost } from '../../../../repositories/content-repository'
  * @returns {Promise<Object>} 수정된 게시물
  */
 export default defineEventHandler(async (event) => {
-  requireAdminSession(event)
+  const adminSession = requireAdminSession(event)
 
   const id = getRouterParam(event, 'id')
   const parsedBody = parseAdminPostInput(await readBody(event))
@@ -22,7 +22,7 @@ export default defineEventHandler(async (event) => {
   }
 
   try {
-    const post = await updateAdminPost(id, parsedBody.data)
+    const post = await updateAdminPost(id, parsedBody.data, adminSession.userId)
 
     if (!post) {
       throw createError({