Prefer infra-managed manifests for bootstrap; reconcile CNPG instances based on Ready+schedulable labeled db nodes; update manifests to use node-role affinity + anti-affinity; add policy/tests and config touch-ups (incl. prole.cfg).
- Introduced `test_init_cloudnative_pg_instances.sh` to validate CNPG instance count enforcement (default 3, configurable via `CNPG_INSTANCES`).
- Implemented support for opt-in Docker image pre-loading (`DOCKER_PRELOAD`/`PROLE_DOCKER_PRELOAD`) in `init_common_services.sh`.
- Added tests and validation for default pre-load behavior and toggle functionality in `test_init_common_services.sh`.
- Made `SERVICE_NAMESPACE` values consistent across configurations.