Updated `DigitalData.Auth.Tests.csproj` to include `Microsoft.EntityFrameworkCore` version `8.0.17`.
Refactored `AuthController.cs` to remove unused imports and update to the latest `DigitalData.Core.Abstraction.Application` namespaces.
Streamlined `DigitalData.Auth.API.csproj`:
- Changed target framework to `net8.0`.
- Upgraded `DigitalData.Core.Abstractions` to `4.3.0` and `DigitalData.Core.Application` to `3.4.0`.
- Added `EnvelopeGenerator` and `Microsoft.EntityFrameworkCore` dependencies.
- Removed outdated `UserManager` dependencies.
Enhanced `Program.cs`:
- Integrated `EnvelopeGenerator` services with database context and caching configuration.
- Removed `AddUserManager` service registration.
- Added SQL Server logging and error handling for `DbContext`.
These changes improve maintainability, adopt modern frameworks, and introduce new functionality with `EnvelopeGenerator`.