71368e5c85
Updated the `ServiceProvider` field in the `ReC.Client` namespace to use conditional compilation for framework-specific behavior: - Added `NET8_0_OR_GREATER` directive to define `ServiceProvider` as nullable (`IServiceProvider?`) for .NET 8.0 or greater. - Retained non-nullable `IServiceProvider` for other frameworks. - Removed redundant `#if nullable` directives to simplify the code. - Streamlined initialization logic for better clarity and maintainability.