Introduce `RecClientTestBase` to streamline integration tests for `ReCClient`.
This abstract class uses `WebApplicationFactory` to create a test server
for `ReC.API` and configures a `ServiceProvider` with necessary services.
It includes helper methods for creating scoped `ReCClient` instances and
ensures proper resource cleanup via `IDisposable`.
Update `ReC.Tests.csproj` to include:
- `Microsoft.AspNetCore.Mvc.Testing` package for integration testing.
- Project references to `ReC.API` and `ReC.Client` for testing purposes.
These changes establish a reusable and maintainable testing infrastructure.
Added ReC.Tests project with integration tests for stored procedure commands and queries via MediatR, covering endpoints, actions, results, and profiles. Introduced a test base for DI/configuration, helper for private property access, and updated the solution to include the new test suite. Tests use NUnit and cover both positive and negative scenarios.
