Preload ARM64 native dependencies for NuGet package loading

Add preloading of ARM Performance Libraries and other libtorch
dependencies on Windows ARM64 before loading torch_cpu.dll and
LibTorchSharp.dll. This fixes native library resolution when
consuming TorchSharp from NuGet packages, where implicit DLL
dependencies cannot be found in the NuGet cache directory.

Follows the same pattern as the existing CUDA DLL preloading.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: alinpahontu2912

src/TorchSharp/Torch.cs

@@ -154,6 +154,19 @@ private static void LoadNativeBackend(bool useCudaBackend, out StringBuilder? tr
                     ok = TryLoadNativeLibraryByName("torch_cuda", typeof(torch).Assembly, trace);
                     ok = TryLoadNativeLibraryByName("LibTorchSharp", typeof(torch).Assembly, trace);
                 } else {
+                    var isWindowsArm64 = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) &&
+                                         RuntimeInformation.ProcessArchitecture == Architecture.Arm64;
+                    if (isWindowsArm64) {
+                        trace.AppendLine($"    Try loading Windows ARM64 native components");
+                        // Preloading these DLLs on Windows ARM64 ensures dependencies are resolved
+                        // when loading from NuGet package directories, similar to the CUDA preloading above.
+                        // ARM64 libtorch uses ARM Performance Libraries instead of Intel OpenMP.
+                        ok = TryLoadNativeLibraryByName("armpl_lp64", typeof(torch).Assembly, trace);
+                        ok = TryLoadNativeLibraryByName("uv", typeof(torch).Assembly, trace);
+                        ok = TryLoadNativeLibraryByName("c10", typeof(torch).Assembly, trace);
+                        ok = TryLoadNativeLibraryByName("torch_global_deps", typeof(torch).Assembly, trace);
+                    }
+
                     ok = TryLoadNativeLibraryByName("torch_cpu", typeof(torch).Assembly, trace);
                     ok = TryLoadNativeLibraryByName("LibTorchSharp", typeof(torch).Assembly, trace);
                 }