[spiccoaura]

Description

This pull request addresses two critical issues reported by the community regarding runtime execution and platform stability:

1. Unity Main Thread Freeze (Issue Freezed and forced shutdown #4): Refactored synchronous native C++ P/Invoke invocations by exposing decoupled asynchronous execution wrappers using UniTask. Inference tasks (Generate and GenerateMultimodal) are now safely offloaded to the non-blocking ThreadPool, eliminating UI starvation and application crashes during heavy token processing cycles.
2. Initialization Failures (Issue Initialisation error #1 & Initialize Gemma Error #3): Removed the rigid Win32 LoadLibrary bottleneck from the static constructor context. Replaced it with an explicit dynamic platform architecture guard using RuntimeInformation.IsOSPlatform(OSPlatform.Windows). This stabilizes cross-platform compilation and deployment fallbacks on alternative operating environments (e.g., Android/Linux).

Impact

• Seamless asynchronous per-token UI update updates via managed main-thread loops synchronization handlers.
• Full unmanaged non-blocking multimodal analysis support integration for PaliGemma sequences.
• Prevents immediate startup sequence crash faults outside pure Windows desktop layouts.