fix: 修正Dockerfile下载链接为特定服务的文件

原脚本中下载的Dockerfile是通用文件，现改为分别下载PHP和PostgreSQL服务的专用Dockerfile，以支持不同服务的容器化部署需求。

vps/init_env.sh

@@ -57,6 +57,7 @@ sed -i "s/appendonly no/appendonly yes/g" /home/app/redis/conf/redis.conf
 
 # 下载Docker Compose文件和Dockerfile
 wget -O /home/app/docker-compose.yml https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/docker-compose.yml
-wget -O /home/app/Dockerfile https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/Dockerfile
+wget -O /home/app/Dockerfile https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/Dockerfile.php
+wget -O /home/app/Dockerfile https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/Dockerfile.postgres
 
 echo "Initialization script completed successfully."