Fix Windows CUDA inference extension build by avoiding torch/extension.h in CUDA translation units

[mathew-felix]

This PR fixes a Windows build failure in src/layers/extensions/inference when compiling kernel.cu with NVCC.

Problem

The build failed in a PyTorch header (torch/csrc/dynamo/compiled_autograd.h) with:

• error C2872: 'std' ambiguous symbol

Root cause (observed)

The failure occurred while compiling kernel.cu, and torch/extension.h was being included in CUDA translation units / headers used by kernel.cu.

Fix

• Avoid torch/extension.h in CUDA-related files (kernel.cu, common.h, def.h)
• Use narrower headers instead (ATen/..., torch/types.h)
• Replace torch::empty_like(...) with at::empty_like(...) in kernel.cu

Validation (local, Windows)

• pip install . succeeds (wheel builds and installs)
• python -c "import torch; import inference_extensions_cuda; print('import ok')" succeeds

This is a build-compatibility fix and does not change model logic.

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