⚡ Bolt: [performance improvement] Optimize SequenceMatcher in vendor lookup

[kourdroid]

💡 What: Pre-initialize difflib.SequenceMatcher and assign the static sanitized_current string to parameter b to cache heuristics outside the loop. Use quick_ratio() to quickly skip expensive ratio() computations for unlikely matches.
🎯 Why: difflib.SequenceMatcher(None, a, b) caches heuristics about the b sequence. Recreating the object or changing b discards this cache. By putting the static string in b and updating a via set_seq1(), we save processing time. quick_ratio() offers an upper bound in O(1) time.
📊 Impact: Measured microbenchmark shows a ~3.5x speedup (~0.22s down to ~0.06s for 1000 iterations). Reduces CPU overhead in fingerprint lookups for large document registries.
🔬 Measurement: Added a standalone performance test demonstrating the improvement. The project test suite passes locally.

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PR created automatically by Jules for task 14926747987523090832 started by @kourdroid

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