docs: 添加systemd service文件备份(deploy/)

deploy/rust-backend-prod.service

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+[Unit]
+Description=Rust Backend Production Service
+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
+
+# ⚠️ 部署前填写实际值
+Environment=DATABASE_URL=postgres://user:pass@host:5432/dbname
+Environment=WECHAT_APPID=your_wechat_appid
+Environment=WECHAT_SECRET=your_wechat_secret
+Environment=JWT_SECRET=your_jwt_secret
+Environment=SSL_KEY_PATH=/etc/ssl/private/private.key
+Environment=SSL_CERT_PATH=/etc/ssl/certs/full_chain.pem
+Environment=RUST_LOG=info
+Environment=APP_VERSION=0.3.0
+Environment=FREE_USER_DATA_LIMIT=20
+Environment=APP_BASE_URL=https://xmclassmate.top
+Environment=ALIPAY_APP_ID=your_alipay_app_id
+Environment=ALIPAY_GATEWAY=https://openapi.alipay.com/gateway.do
+Environment=ALIPAY_ALIPAY_PUBLIC_KEY=your_alipay_public_key
+Environment=ALIPAY_PRIVATE_KEY=your_private_key_base64
+
+NoNewPrivileges=yes
+PrivateTmp=yes
+ProtectSystem=strict
+ProtectHome=read-only
+ReadWritePaths=/root/rust/rust_backend
+
+SyslogIdentifier=rust-backend
+
+[Install]
+WantedBy=multi-user.target