[2026-04-14][refactor][general] replace hardcoded error messages with standardized error codes across all services and controllers

👤 Author : Matoraaa
🌿 Branch : master
🔗 Commit : 5d6d14e
📅 Date : 2026-04-14
📝 Note :
refactor: replace hardcoded error messages with standardized error codes across all services and controllers