Updated application and infrastructure layers to include MediatR, FluentValidation, AutoMapper, and Entity Framework Core.
- Added new dependencies to `DigitalData.TaskFlow.Application.csproj` and `DigitalData.TaskFlow.Infrastructure.csproj` for MediatR, FluentValidation, AutoMapper, and EF Core.
- Configured MediatR with options and license key support.
- Registered validators and AutoMapper profiles in the application layer.
- Introduced `MediatROptions` and `SwaggerOptions` for configuration.
- Updated `appsettings.json` with connection strings and configuration sections for MediatR and Swagger.
- Replaced placeholder comments in `DependencyInjection` classes with actual service registrations.
- Upgraded `Swashbuckle.AspNetCore` and added `FluentValidation.AspNetCore` for API validation.
Introduced `DependencyInjection.cs` in Application and Infrastructure layers to centralize service registration. Updated project files to include necessary package references (`Microsoft.Extensions.Configuration.Abstractions` and `Microsoft.Extensions.DependencyInjection.Abstractions`) and project dependencies between layers. Integrated service registration in `Program.cs` to enable modular architecture for the API.
Added three new projects: `DigitalData.TaskFlow.Domain`,
`DigitalData.TaskFlow.Application`, and
`DigitalData.TaskFlow.Infrastructure` to the solution.
Updated the solution file to include their paths, GUIDs,
build configurations, and nested structure.
Each project targets `.NET 8.0`, uses `Microsoft.NET.Sdk`,
and enables implicit usings and nullable reference types.
Introduced an `ExtensibilityGlobals` section with a
`SolutionGuid` for better solution management.
