Fix NPU hardware accelerator detection for custom models loaded from AITK converted genai_config.json

[Copilot]

AITK-converted NPU models were incorrectly tagged as CPU because the detection logic couldn't parse diverse execution provider configurations from genai_config.json.

Changes

Enhanced GenAI Config Parsing (GenAIConfig.cs)

• Replaced rigid Dml/Cuda classes with flexible JsonExtensionData parsing to support diverse execution providers (QNN, OpenVINO, VitisAI, DML, CUDA, etc.)
• Added pipeline-level SessionOptions support—AITK configs specify EPs at both decoder and pipeline levels
• Implemented HasProvider() and GetProviderOptions() for dynamic provider detection

internal class ProviderOptions
{
    [JsonExtensionData]
    public Dictionary<string, JsonElement>? ExtensionData { get; set; }

    public bool HasProvider(string name) =>
        ExtensionData?.Keys.Any(k => k.Equals(name, StringComparison.OrdinalIgnoreCase)) ?? false;
}

Hardware Detection (DeviceUtils.cs, ExecutionProviderNames.cs)

• Added HasNPU() using ONNX Runtime's EP device detection
• Implemented GetAvailableExecutionProviders() with certified EP registration and caching
• Created ExecutionProviderNames constants class to eliminate hardcoded EP strings

Model Classification (UserAddedModelUtil.cs)

• Rewrote GetHardwareAcceleratorFromConfig() to:
  • Scan both decoder-level and pipeline-level provider options
  • Detect NPU configs (QNN, OpenVINO with NPU device type, VitisAI)
  • Apply priority: QNN → DML → NPU → GPU → CPU
• Added ValidateExecutionProviders() to check EP availability before model load
• Display warning dialog when required EPs are unavailable

Compatibility Checks (ModelCompatibility.cs)

• Added NPU compatibility validation with proper error messaging
• Split CPU/QNN/NPU compatibility checks for clarity

Code Quality

• Standardized EP references using ExecutionProviderNames constants
• Refactored using LINQ for improved readability

Before/After

Before: NPU model shows CPU tag

After: NPU model correctly tagged

Warning dialog for unavailable EPs:

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