changed user_id as UUID

feat: Implement forgot password feature with email reset functionality

added fullname and removed metdata from login response

docs(merchant_type): Standardize merchant type references to lowercase

docs(merchant_type): Update merchant type references from salon to retail and NCNF

refactor(models): make first_name optional in SystemUserModel

feat(system_users): Add merchant_type field and list endpoint with projection support

feat(system_users): Add merchant_id field to user model and authentication tokens

feat: implement user migration and update role handling in database initialization

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

user roles changes

feat: Implement System Users module for authentication and user management