feat: 更新前端Dockerfile和docker-compose配置，修正nginx配置文件路径并完善部署指南

docker-compose.github.image.yml

@@ -76,6 +76,8 @@ services:
       - TZ=Asia/Shanghai
     ports:
       - "80:80"
+    volumes:
+      - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
     depends_on:
       backend:
         condition: service_healthy