e69bc9cdb9001709e1fcb4fdd76e373492e1efe3
Updated `RecActions.InvokeAsync(...).Sync()` to align with migration guidelines, marking `Sync()` as `[Obsolete]` and recommending `async/await` for asynchronous patterns. Enhanced `BuildStaticClient` methods to include an optional `configureOptions` parameter for flexible `ReCClientOptions` configuration. Added conditional compilation for nullable reference type compatibility across .NET Framework and modern .NET versions. Updated `Services.AddRecClient` calls to support `configureOptions`. Retained `[Obsolete]` on static helpers to encourage dependency injection (`services.AddRecClient(...)`) for new code. Revised migration notes to emphasize deprecation of synchronous methods, static helpers, and the importance of adopting modern async and DI patterns. Clarified changes to `GetAsync` methods, error handling with `ReCApiException`, and deserialization behavior.
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