Updated `ReCClientOptions` to include a warning about the `LogSuccessfulRequests` option throwing an `InvalidOperationException` if no `ILogger` is registered via DI. Added validation and thread-safety to `BuildStaticClient` using `Lazy<IServiceProvider>`.
Introduced `StaticBuildConfiguration` for callback-based configuration and detailed its properties. Clarified usage patterns, added VB.NET and C# examples, and documented validation rules.
Marked older `BuildStaticClient` overloads as `[Obsolete]` while retaining functionality. Expanded context on static client use cases and synchronous wrappers. Improved documentation clarity and consistency.