Feature Request: [Grid] SWIM Env Vars Do Not Support DNS Hostnames

[mvazquezc]

Problem:

GRID_SWIM_ADVERTISE_ADDR and GRID_SWIM_SEEDS use SocketAddr::from_str(), which only accepts ip:port. AWS NLBs return DNS hostnames. This forces operators to resolve hostnames to IPs before deploying, and to use Elastic IPs for stability.

Proposal:

Accept hostnames in SWIM env vars by performing DNS resolution at startup, with a fallback to SocketAddr parsing. Alternatively, support CRD-only seed configuration where GridNetwork.spec.seeds handles DNS resolution during reconciliation.