[borodino] fix(ak47): split large CIDRs into subnets instead of skipping

Commit 7e54631

Description

IPv4 CIDRs with prefix < /24 are now split into /24 subnets and scanned until exhaustion. IPv6 CIDRs with prefix < /112 are split into /112 subnets (capped at 256 to avoid infinite iteration on /32→/112 = 2^80).

Each subnet is scanned individually and the XML is deleted after import, preventing the disk exhaustion caused by multi-GB nmap output files.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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