docs(ops): 补齐生产 runbook 和 readiness 清单

- 新增迁移回滚、AppData 退场、小宝后台任务 runbook\n- 新增生产 readiness 证据清单和 runbook placeholder 扫描\n- 更新部署文档与路线图到 V2.8 运维闭环阶段\n\nCo-Authored-By: GPT-5 Codex <codex@openai.com>

package.json

@@ -14,6 +14,7 @@
     "backup:postgres": "node scripts/backup-postgres.mjs",
     "restore:postgres": "node scripts/restore-postgres.mjs",
     "backup:server-data": "node scripts/backup-server-data.mjs",
+    "docs:check-runbooks": "node scripts/check-runbook-placeholders.mjs --paths docs/runbooks docs/production-readiness.md",
     "deploy:local:build": "docker compose --env-file .env.local-server -f docker-compose.local.yml build",
     "deploy:local:up": "docker compose --env-file .env.local-server -f docker-compose.local.yml up -d",
     "deploy:local:down": "docker compose --env-file .env.local-server -f docker-compose.local.yml down",