Enrich multiple IP addresses

Enrich up to 1,000 IP addresses in a single request. Invalid, private, and reserved entries are skipped and duplicates collapse to one result, so the response may hold fewer results than the request had entries. Billed at a 10% discount on what is actually looked up: ceil(n × 0.9) credits for n distinct usable IPs. The batch is all-or-nothing: if the team or the key cannot cover it, nothing is looked up or billed.