Fix BBOTTarget pickle support for engine subprocess

[liquidsec]

Summary

• BBOTTarget contains a RadixTarget (Rust/C extension) which can't be pickled. This breaks the HTTP engine subprocess spawn at runtime with cannot pickle 'builtins.PyRadixTarget' object.
• Add __getstate__/__setstate__ to BaseTarget and ScanBlacklist so the radix tree is reconstructed from event_seeds after deserialization.
• Tests didn't catch this because BBOT_TESTING=True runs the engine in-process (same event loop), bypassing the pickle path entirely.
• Added test_target_pickle to cover pickle round-trips.

[github-actions]

📊 Performance Benchmark Report

Comparing 3.0 (baseline) vs fix-target-pickle (current)

📈 Detailed Results (All Benchmarks)

📋 Complete results for all benchmarks - includes both significant and insignificant changes

🧪 Test Name	📏 Base	📏 Current	📈 Change	🎯 Status
Bloom Filter Dns Mutation Tracking Performance	4.25ms	4.22ms	-0.7% ⚪	✅
Bloom Filter Large Scale Dns Brute Force	17.56ms	17.32ms	-1.4% ⚪	✅
Large Closest Match Lookup	356.39ms	354.74ms	-0.5% ⚪	✅
Realistic Closest Match Workload	189.19ms	191.01ms	+1.0% ⚪	✅
Event Memory Medium Scan	1768 B/event	1766 B/event	-0.1% ⚪	✅
Event Memory Large Scan	1757 B/event	1757 B/event	+0.0% ⚪	✅
Event Validation Full Scan Startup Small Batch	408.85ms	399.79ms	-2.2% ⚪	✅
Event Validation Full Scan Startup Large Batch	593.70ms	571.52ms	-3.7% ⚪	✅
Make Event Autodetection Small	31.15ms	30.38ms	-2.5% ⚪	✅
Make Event Autodetection Large	313.24ms	309.92ms	-1.1% ⚪	✅
Make Event Explicit Types	13.81ms	13.59ms	-1.6% ⚪	✅
Excavate Single Thread Small	4.006s	3.887s	-3.0% ⚪	✅
Excavate Single Thread Large	9.824s	9.350s	-4.8% ⚪	✅
Excavate Parallel Tasks Small	4.237s	4.058s	-4.2% ⚪	✅
Excavate Parallel Tasks Large	7.387s	7.147s	-3.3% ⚪	✅
Is Ip Performance	3.19ms	3.23ms	+1.4% ⚪	✅
Make Ip Type Performance	11.69ms	11.50ms	-1.6% ⚪	✅
Mixed Ip Operations	4.53ms	4.58ms	+1.2% ⚪	✅
Typical Queue Shuffle	62.39µs	61.51µs	-1.4% ⚪	✅
Priority Queue Shuffle	705.41µs	689.09µs	-2.3% ⚪	✅

🎯 Performance Summary

✅ No significant performance changes detected (all changes <10%)

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🐍 Python Version 3.11.15

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91%. Comparing base (450946f) to head (2032b04).
⚠️ Report is 2 commits behind head on 3.0.

Additional details and impacted files

@@          Coverage Diff          @@
##             3.0   #2983   +/-   ##
=====================================
+ Coverage     91%     91%   +1%     
=====================================
  Files        436     436           
  Lines      36892   36918   +26     
=====================================
+ Hits       33516   33546   +30     
+ Misses      3376    3372    -4     

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