chore: remove unused timezone import from seed_demo_data()

[devin-ai-integration]

chore: remove unused timezone import from seed_demo_data()

Summary

Removes the unused from datetime import timezone statement inside seed_demo_data() in main.py. The symbol is never referenced in the function body — datetime.utcnow() is used instead of timezone-aware datetimes. This was a speculative import from initial code generation.

Review & Testing Checklist for Human

• Confirm timezone is not referenced anywhere else in main.py (e.g., grep -n timezone main.py)
• Run python main.py --demo to verify seed_demo_data() still works correctly after removal

Notes

• Candidate ID: 7041ae59768c
• Link to Devin Session
• Requested by: bot_apk

[devin-ai-integration]

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