Fix/mascot download static serving

[yyuneu]

Summary

• [FIX] GLB 다운로드 중간 끊김 — nginx static 서빙으로 전환하여 admin-bff JVM 우회 #204
• /internal/files/ 경로를 admin-bff 프록시에서 nginx direct static 서빙으로 전환
• nginx 컨테이너에 uploads Docker named volume을 read-only 마운트

Tasks

• deploy/nginx.conf.template — /internal/files/ location을 alias /srv/files/ + sendfile로 교체, GLB/PDF/이미지 MIME type 명시, Accept-Ranges 헤더 추가
• deploy/docker-compose.prod.yml — nginx 서비스에 uploads:/srv/files:ro 볼륨 추가

To Reviewer

• Java 코드(FileDownloadController) 변경 없음. 로컬 dev 환경(FILE_BASE_URL=localhost:8081)에서는 기존대로 JVM이 서빙. prod에서만 nginx가 location을 먼저 가로채서 JVM
  미경유.
• alias + location 끝 슬래시 정합성 확인: /internal/files/ → /srv/files/ 매핑 정확함.
• autoindex 기본 off이므로 디렉터리 목록 노출 없음. 해당 파일들은 기존에도 무인증 공개 서빙이라 보안 회귀 없음.

Screenshot

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