Add admin.html volume mount to docker-compose

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -5,6 +5,7 @@ services:
       - "880:8080"
     volumes:
       - ./index.html:/app/index.html:ro
+      - ./admin.html:/app/admin.html:ro
       - ./server.js:/app/server.js:ro
       - ./database.js:/app/database.js:ro
       - ./:/app/data