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.
TekH
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