添加systemd service文件，更新部署脚本格式

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

rust-backend.service

@@ -0,0 +1,31 @@
+[Unit]
+Description=Rust Backend Service (Weather Data Collection API)
+After=network.target postgresql.service
+Wants=network.target
+
+[Service]
+Type=simple
+User=root
+Group=root
+WorkingDirectory=/root/rust/rust_backend
+ExecStart=/root/rust/rust_backend/rust-backend
+Restart=always
+RestartSec=5
+StandardOutput=journal
+StandardError=journal
+
+# 环境变量配置
+EnvironmentFile=/root/rust/rust_backend/.env
+
+# 安全加固
+NoNewPrivileges=yes
+PrivateTmp=yes
+ProtectSystem=strict
+ProtectHome=read-only
+ReadWritePaths=/root/rust/rust_backend
+
+# 日志标识
+SyslogIdentifier=rust-backend
+
+[Install]
+WantedBy=multi-user.target