chore(ops): keep every operations credential name in .env.example and map where each lives

- .env.example lists the keys the scripts actually read (NAS_HOST/NAS_USER/
  NAS_SSH_PORT/NAS_DEPLOY_PATH, web build args, Supabase access token and
  project ref, CRON_SECRET, Cloudflare token/account/zone/tunnel) and drops
  unused ones (DSM_HOST, NAS_DEPLOY_ROOT, NAS_ADMIN_PORT, NAS_LANDING_PORT,
  APP_DOMAIN, ADMIN_DOMAIN).
- docs/map/02-infrastructure.md gains a credentials map (names only) with the
  matching Forgejo/Supabase/NAS copies, plus the public routing summary.
- Deploy scripts no longer point to the removed /admin static page or portal.

scripts/deploy-nas.sh

@@ -140,8 +140,7 @@ cat <<EOF > "$OUT_DIR/README.txt"
    ./nas-control.sh start  (또는 docker compose up -d)
 
 5. 브라우저에서 접속 확인:
-   - 포털 메인: http://<NAS_IP>:$PORT/
-   - 관리자 백오피스: http://<NAS_IP>:$PORT/admin
+   - 관리자: http://<NAS_IP>:3001 (공개 주소 https://admin.chanpaca.net)
    - API Swagger: http://<NAS_IP>:$PORT/swagger
    - 헬스체크: http://<NAS_IP>:$PORT/health
    - 웹앱: http://<NAS_IP>:3002/app/login (공개 주소 https://d3ro.chanpaca.net/app 는 사이트 브리지 워커 경유)