Include network interface info in SCAN event

[liquidsec]

Summary

• Adds a network key to the SCAN event data containing hostname, primary outbound IP, all network interfaces (IPv4/IPv6 with netmasks), and default routes
• Uses psutil (existing dep) for interface enumeration and /proc/net/route for default gateway detection (graceful fallback on non-Linux)
• Enables correlating scan activity back to a specific agent/IP

Closes #2137

[github-actions]

🚀 Performance Benchmark Report

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[codecov]

Codecov Report

❌ Patch coverage is 87.09677% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 90%. Comparing base (82df903) to head (3d029bb).
⚠️ Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/scanner/scanner.py	85%	8 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #3211   +/-   ##
=====================================
- Coverage     90%     90%   -0%     
=====================================
  Files        453     453           
  Lines      46101   46163   +62     
=====================================
+ Hits       41216   41265   +49     
- Misses      4885    4898   +13     

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