Dnsfilter renames Basic plan to Core, raises retention across all tiers

Report Retention and Query Log Retention were leveled up to a single tier for all plans: Report Retention is now 90 days (previously 30/60/90 days across Basic/Pro/Enterprise) and Query Log Retention is now 9 days (previously 3/6/9 days), raising retention for the lower plans to the former top-tier limits. The Administrative Audit Log was also added to the entry Core plan (previously excluded).

The entry-level plan was renamed from "Basic" to "Core"; it retains the same position in the lineup and was simultaneously upgraded with Administrative Audit Log, Query Log Export, Chat Support, and top-tier retention limits.