build(docker): 更新 docker-compose配置

- 将 Nginx 容器的端口映射改为使用环境变量 APP_PORT- 移除 frontend 服务的依赖

docker-compose.yml

@@ -29,7 +29,7 @@ services:
     container_name: bilinote-nginx
     image: nginx:1.25-alpine
     ports:
-      - "80:80"
+      - "${APP_PORT}:80"
     volumes:
       - ./nginx/default.conf:/etc/nginx/conf.d/default.conf
     depends_on: