Updated the application to use Azure Key Vault for managing secrets, including the addition of a new `SurgeKeyVaultSecretManager` class. Modified configuration files to include `KeyVaultName` and removed sensitive `Jwt` sections for enhanced security.
Refactored `IAuthService` and `IUserRepository` to utilize DTOs instead of the `User` entity. Removed the `UserMap` class and updated the `UserRepository` to focus on DTOs for user management.
The `AuthService` class now communicates with an external API for authentication, and new classes for API requests and responses have been added. Updated project dependencies to support Azure Key Vault integration.
