[2026-03-03][refactor][general] adjust data structure to nest customer information under `customerIdentity` in `Ticket` and `Message` objects.

👤 Author : Dapanel
🌿 Branch : main
🔗 Commit : 1428c10
📅 Date : 2026-03-03
📝 Note :
refactor: adjust data structure to nest customer information under customerIdentity in Ticket and Message objects.