Added automatic banning of linked accounts. The new `ban_alts` option accepts four different values with escalating levels of enforcement: Disabled, Enabled, Enhanced, and Extreme. By default, it is disabled.
Added configurable filter duration for linked accounts (`dupeip_scan_filter_duration: 7d`), which is intended to prevent or reduce false positives by ensuring that only recent IP addresses are scanned with /alts, or when banning accounts automatically as...