Add RF3 load testing profiles and seed tooling

[Osvaldo Andrade (osvaldoandrade)]

Summary

• add single-client and RF=3 compose/config profiles, including bulk-load overrides
• add marketplace seed/load tooling and geo loader support
• harden multi-Raft metadata, plugin index, SQL scan, and placement behavior covered by focused tests

Validation

• env GOCACHE=/private/tmp/cefas-gocache go test ./internal/catalog ./internal/placement ./internal/plugin/builtin/geohash ./internal/plugin/builtin/audience ./internal/replication ./internal/server ./cmd/cefas-route-loadtest ./cmd/cefas-geo-loader ./cmd/cefasdb
• python3 -m py_compile scripts/loadtest/marketplace_seed.py
• docker compose -f deploy/docker-compose.yml config
• docker compose -f deploy/docker-compose.cluster.yml -f deploy/docker-compose.cluster.bulk-load.yml config