feat(ops): 添加生产监控告警基线

- 新增 Prometheus/Grafana/Loki/Promtail 监控 profile\n- 覆盖 DB、磁盘、慢 API、慢 Prisma、任务失败和小宝摘要 stale 告警\n- 补充 postgres-exporter 自定义查询、Dashboard、部署文档和校验\n\nCo-Authored-By: GPT-5 Codex <codex@openai.com>

deploy/monitoring/postgres/postgres-queries.yml

@@ -0,0 +1,12 @@
+ftb_xiaobao:
+  query: |
+    SELECT
+      count(*)::float AS stale_summary_count
+    FROM xiaobao_risk_summaries
+    WHERE dirty = true
+       OR updated_at < now() - interval '6 hours';
+  metrics:
+    - stale_summary_count:
+        usage: GAUGE
+        description: Xiaobao risk summaries that are dirty or older than 6 hours.
+