chore(blog): /work/blog 라우트·참조·메타 완전 제거 (2026-05-29 재정의)

- app/work/blog/, lib/blog-tools/ 폴더 삭제
- 홈·work 허브 카드/카피, footer 링크에서 블로그 자동화 제거
- layout.tsx keywords·description·JSON-LD Offer 제거
- refund 약관 상품 목록 정리, sitemap /services/blog 엔트리 제거
- next.config: /services/blog·/work/blog → /work 301 리다이렉트

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/sitemap.ts

@@ -7,7 +7,6 @@ export default function sitemap(): MetadataRoute.Sitemap {
   return [
     { url: base, lastModified: now, changeFrequency: 'weekly', priority: 1.0 },
     { url: `${base}/services/music`, lastModified: now, changeFrequency: 'weekly', priority: 0.95 },
-    { url: `${base}/services/blog`, lastModified: now, changeFrequency: 'weekly', priority: 0.9 },
     { url: `${base}/saju`, lastModified: now, changeFrequency: 'monthly', priority: 0.7 },
     { url: `${base}/legal/terms`, lastModified: now, changeFrequency: 'yearly', priority: 0.3 },
     { url: `${base}/legal/refund`, lastModified: now, changeFrequency: 'yearly', priority: 0.3 },