- Add daily_digest boolean and daily_digest_hour fields to NotificationPreference model
- Update HandleDailyDigest to check user preferences and custom notification times
- Change Daily Digest scheduler to run hourly (supports per-user custom times)
- Update notification service DTOs for new fields
- Add Daily Digest toggle and custom time to admin notification prefs page
- Fix notification handlers to only notify users at their designated hour
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Co-Authored-By: Claude <noreply@anthropic.com>
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