hotfix: Apply a temp hotfix for sessions.chat

[creatorrr]

:rocket:	This description was created by Ellipsis for commit 90228aba3862e09be0a6c9720b74771d4668f84c

fix: temporary hotfix for datetime serialization in chat messages

Summary:

Applies a temporary hotfix for datetime serialization in chat.py and sorts entries by created_at in get_history.py.

Key points:

• Hotfix in chat.py: Temporary fix for non-serializable datetime objects by converting messages to dictionaries with role, content, and user fields.
• Sorting in get_history.py: Sorts entries by created_at to ensure correct order.

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