Draft: chore: update Grafana to 12.3.1 and PostgreSQL to 18

Nikolay Samokhvalovrequested to merge
claude/update-grafana-postgres-tKng6 into main
  • Update Grafana from 12.0.2 to 12.3.1 (latest stable)
  • Update PostgreSQL from 15 to 18 in docker-compose and Helm
  • Update Grafana datasource postgresVersion from 1500 to 1800

PostgreSQL 18 brings up to 3x I/O performance improvements and better index utilization. pgwatch v3 supports PostgreSQL 14-18 with version-aware queries that automatically adapt.

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