[Debug] CloudKit & CoreData sync logging

[zinkxx]

🎯 Goal

Provide detailed and structured logging for CloudKit & CoreData sync operations to simplify debugging.

📌 Scope

• Log sync start/end events
• Log conflicts and resolution decisions
• Log CloudKit and CoreData errors

🧠 Technical Notes

• Debug-only logging
• Categorized logs (sync, conflict, error)
• Optional file or console output

✅ Acceptance Criteria

• Sync flow is traceable in debug builds
• Logs clearly explain failures or conflicts
• No sensitive data is logged
• Logging is disabled or minimal in release builds