feat(monitoring): add Grafana dashboard for ClickHouse
- Add Prometheus datasource provisioning config - Add Grafana dashboard provider configuration - Add ClickHouse Overview dashboard (JSON) - Update README.md with monitoring section and updated stack badge - Update docs/OPERATIONS.md with monitoring runbook Dashboard includes: - System Health: CPU, Memory Resident, Memory Code - Query Performance: queries/sec, active queries, failed queries - MergeTree Storage: parts count, merge rate Verified via Context7: ClickHouse Prometheus metrics use ClickHouseAsyncMetrics_*, ClickHouseMetrics_*, ClickHouseProfileEvents_* prefixes in v25.1. Access: - Grafana: http://localhost:3000 (admin/admin) - Prometheus: http://localhost:9090
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