feat(customer_auth): Extract customer token logic into dedicated service

feat(auth): Add backward compatibility for customer token type migration

fix(customer_auth): Refactor SystemUserService initialization and token verification

feat(customer_auth): Implement OTP-based customer authentication system

removed first_name and last_name added full_name

Implement structured logging system across AUTH Microservice

Enhance error handling and logging across authentication and user management endpoints

refactor: update user role handling to use string identifiers instead of enum values

feat: Implement System Users module for authentication and user management