feat: implement cache decorator with internal storage

[volodymyrlp]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your cache decorator implementation fully meets all core requirements. The code correctly handles caching with variable arguments, maintains separate storage per decorated function, prints the appropriate messages, and follows Python conventions. The only issue flagged is a minor style violation — a missing trailing newline at the end of app/main.py (W292). This is a cosmetic issue that doesn't affect functionality and will be automatically handled by your linter. Your solution is approved.

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[Losiev]

Approved. Well done!