Smarter cache invalidation - only affected data refreshes.

Before: Some operations triggered broad cache clears.

Now: Surgical invalidation: Update category → Only that category + its products refresh (unrelated products untouched)

Benefits:

• Faster edits - No waiting for full cache rebuilds

• Relationship-aware - Invalidation logic understands data connections

• Debug visibility - Cache hit/miss rates in developer tools

Dramatically improves the edit-preview-edit workflow during active development.