ops(publish): compose fastapi 에 STUDY_PUBLISH_ENABLED + VIEWER_SYNC_TOKEN 환경 매핑

env_file(credentials.env)+environment ${VAR} 치환 구조라, host .env 만으로는
컨테이너에 도달 안 함(INTERNAL_WORKER_TOKEN 선례). 발행 게이트/feed 토큰을
environment 블록에 명시 매핑 — 기본 false/빈값(default-deny), host .env override.

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

docker-compose.yml

@@ -210,6 +210,9 @@ services:
       # PR-MacMini-Derived-Worker-1
       - STUDY_EXPLANATION_ENABLED=${STUDY_EXPLANATION_ENABLED:-true}
       - INTERNAL_WORKER_TOKEN=${INTERNAL_WORKER_TOKEN}
+      # docsrv-viewer-publish: 발행 워커/저작 enqueue 게이트(기본 false=inert) + 뷰어↔DS feed Bearer.
+      - STUDY_PUBLISH_ENABLED=${STUDY_PUBLISH_ENABLED:-false}
+      - VIEWER_SYNC_TOKEN=${VIEWER_SYNC_TOKEN:-}
       # Voice Memo PoC v1 — bot 계정 한정 long-expiry access token. default false → 일반 운영 영향 0.
       # 활성화: host .env 에 VOICE_MEMO_BOT_TOKEN_ENABLED=true. plan: rosy-launching-otter.md
       - VOICE_MEMO_BOT_TOKEN_ENABLED=${VOICE_MEMO_BOT_TOKEN_ENABLED:-false}