⚡ Bolt: Optimize file extension checks by preventing string allocation o (salvages #170)

[abhimehro]

Salvage of #170

Rebased on main (Seatek batch 1).

Salvages: #170

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PR Summary

Low Risk
Low risk performance tweak that only affects language detection by file extension; coverage is extended with mixed-case tests to guard behavior.

Overview
Improves get_language to avoid per-call string allocations by checking file extensions via .endswith() with mixed-case tuples (instead of normalizing via .lower()), keeping language detection fast.

Adds a small mixed-case extension test in tests/test_code_health_scanner.py and documents the optimization in .jules/bolt.md.

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