fix : rename misleading cache_hits to cached_items in ml_recommender

[tmdeveloper007]

Summary of What Has Been Done

Fixed the misleading cache_hits field in src/utils/ml_recommender.py get_model_metrics method. The field was returning len(self.cache) (the current number of cached items) instead of actual cache hit counts.

Changes Made

• Renamed cache_hits to cached_items in get_model_metrics to accurately reflect what the metric measures
• Removed the now-unused _count_cache_hits helper method

Impact it Made

• Ensures API consumers understand the metric represents cached items, not hit counts
• Removes dead code (_count_cache_hits method is no longer needed)
• Provides accurate naming that matches the actual data returned

Note

Please assign this PR to the tmdeveloper007 account.

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