Added the `MediatR` NuGet package (v13.1.0) to enable the mediator pattern. Updated `ReC.Application.csproj` to include a project reference to `ReC.Domain`.
Introduced `RecActionDto` as a Data Transfer Object (DTO) for representing "RecAction" details, including properties for endpoints, authentication, and SQL connections.
Added `ReadRecActionQuery` to handle queries for retrieving `RecActionDto` objects, leveraging MediatR. This query filters results based on `ProfileId`.
A new project, `ReC.Application`, has been added to the solution (`ReC.sln`).
The project file (`ReC.Application.csproj`) targets .NET 8.0, enables implicit
global usings, and enables nullable reference types.
The solution file has been updated to include the new project, its build
configurations, and its nesting under the `src` folder.
