fix: system1-web bind mount를 public/으로 수정

bind mount가 web/ 전체를 웹루트에 마운트하여 Dockerfile의 COPY public/을
덮어쓰고 있었음. public/ 서브디렉토리만 마운트하도록 수정.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -136,7 +136,7 @@ services:
     ports:
       - "30080:80"
     volumes:
-      - ./system1-factory/web:/usr/share/nginx/html:ro
+      - ./system1-factory/web/public:/usr/share/nginx/html:ro
     depends_on:
       system1-api:
         condition: service_healthy