Рефакторинг core

この issue には説明がありません。

The issue title is in Russian and only says 'Refactoring core' with no body text. Examine the repository structure to understand the core modules, likely in a directory like 'core' or 'bot'. Look for entry points in main.py or app.py. Determine what 'refactoring' means here by checking recent commits or similar issues. Running existing tests can help identify areas needing improvement.

索引モデルが issue の本文から書いたものです。