⚡ Cache primer scoring tables in Repliconf

[google-labs-jules]

Extracted the construction of prim_score_lookup and stab_score_lookup tables into a standalone function _get_scoring_tables decorated with @lru_cache.

To support lru_cache with unhashable ReplicationSettings objects, a _SettingsWrapper class was introduced which implements __hash__ and __eq__ based on object identity.

This change reduces the overhead of Repliconf.search() when called repeatedly with the same primer and settings, as the expensive table construction is performed only once and cached. Benchmarks showed a ~26% performance improvement in scenarios dominated by setup costs (short templates or frequent re-initialization).

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PR created automatically by Jules for task 879776912555508310 started by @fangfufu

[google-labs-jules]

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