feat: ship blog platform admin and deploy stack

deploy/systemd/README.md

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+# systemd timer 模板
+
+这些模板默认假设：
+
+- 仓库部署路径：`/opt/termi-astro`
+- 使用 `docker compose -f deploy/docker/compose.package.yml --env-file deploy/docker/.env`
+- backend / backend-worker 容器已长期运行
+
+启用方式示例：
+
+```bash
+sudo cp deploy/systemd/*.service /etc/systemd/system/
+sudo cp deploy/systemd/*.timer /etc/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable --now termi-backup-all.timer
+sudo systemctl enable --now termi-backup-prune.timer
+sudo systemctl enable --now termi-backup-offsite-sync.timer
+sudo systemctl enable --now termi-retry-deliveries.timer
+sudo systemctl enable --now termi-weekly-digest.timer
+sudo systemctl enable --now termi-monthly-digest.timer
+```
+
+如果你们不使用 systemd，也可以直接参考同目录命令改成 cron。
+
+最终上线前建议再对照：
+
+- `deploy/systemd/GO_LIVE_CHECKLIST.md`