refactor(docker): 重构容器配置并添加PostgreSQL支持

- 将Dockerfile重命名为Dockerfile.php以明确用途
- 新增Dockerfile.postgres用于构建带pgvector扩展的PostgreSQL镜像
- 拆分初始化SQL脚本为mysql和postgres专用版本
- 更新docker-compose配置以使用新的构建文件
- 修改init_env.sh脚本适配新的初始化文件路径

重构目的是提高配置的模块化和可维护性，同时为系统添加PostgreSQL向量搜索支持。

vps/init_env.sh

@@ -44,10 +44,12 @@ wget -O /home/app/nginx.conf https://raw.githubusercontent.com/shakenny/containe
 wget -O /home/app/conf.d/default.conf https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/default.conf
 
 wget -O /home/app/mysql/conf.d/my.cnf https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/my.cnf
-wget -O /home/app/mysql/conf.d/init.sql https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/init.sql
+wget -O /home/app/mysql/conf.d/init.sql https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/init_mysql.sql
 
 wget -O /home/app/redis/conf/redis.conf https://raw.githubusercontent.com/redis/redis/7.2/redis.conf
 
+wget -O /home/app/postgresql/init.sql https://raw.githubusercontent.com/shakenny/containerized-stack/refs/heads/main/vps/init_postgres.sql
+
 # 修改Redis配置文件
 sed -i "s/bind 127.0.0.1 -::1/bind 0.0.0.0/g" /home/app/redis/conf/redis.conf
 sed -i "s/# requirepass foobared/requirepass \!Ybw324\!/g" /home/app/redis/conf/redis.conf