Added requirements files for different hardware vendors

requirements-amd.txt

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+# AMD GPU requirements (ROCm)
+# Usage: pip install -r requirements-amd.txt
+#
+# Note: This is for AMD GPUs with ROCm support.
+# For experimental Windows/Linux support on RDNA 3/3.5/4, see README.md
+
+--index-url https://download.pytorch.org/whl/rocm7.1
+--extra-index-url https://pypi.org/simple
+
+-r requirements.txt

requirements-intel.txt

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+# Intel GPU requirements (XPU - Arc GPUs)
+# Usage: pip install -r requirements-intel.txt
+
+--index-url https://download.pytorch.org/whl/xpu
+--extra-index-url https://pypi.org/simple
+
+-r requirements.txt

requirements-nvidia.txt

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+# NVIDIA GPU requirements (CUDA 13.0)
+# Usage: pip install -r requirements-nvidia.txt
+
+--extra-index-url https://download.pytorch.org/whl/cu130
+
+-r requirements.txt