⚡ Bolt: Optimize type-checking conditionals for polymorphic inputs

[ManupaKDU]

💡 What: Reordered the type-checking conditionals in is_reachable to check for pre-instantiated IP objects before performing string validation.
🎯 Why: To optimize the hot-path. The function frequently receives pre-instantiated IP objects during parallel scanning. Checking for strings and their length first adds unnecessary CPU overhead for the most common case.
📊 Impact: Reduces redundant validation steps and try-except overhead for valid IP objects in high-frequency concurrent loops.
🔬 Measurement: Verify via unit tests. The unit tests ensure string lengths are still validated correctly and functional behavior remains completely identical.

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PR created automatically by Jules for task 11007230515922044400 started by @ManupaKDU

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