🧪 [testing improvement] Add tests for cleanup_ddos_history

[marko1olo]

🎯 What: The testing gap addressed is the lack of tests for the cleanup_ddos_history function in Dubsite_tgach/security.py.
📊 Coverage: The scenarios covered include empty history, old history entries (older than 10 minutes), recent history entries, and edge cases like an empty list for an IP's history.
✨ Result: Test coverage for DDOS protection logic is improved, making refactoring of security modules safer.

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PR created automatically by Jules for task 5362558080687340605 started by @marko1olo

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