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* [Bugfix] Add NVIDIA HPC SDK support in CUDA detection (#974)

Enhanced CUDA detection to recognize NVIDIA HPC SDK installations:
- Added path check for nvhpc in nvcc binary path
- Added fallback scan for default nvhpc paths:
  /opt/nvidia/hpc_sdk/Linux_x86_64
- Maintained backward compatibility with standard CUDA installations

Verification:
- Tested on Ubuntu 24.04 with NVIDIA HPC SDK 25.7
- Confirmed detection works without manual CUDA_HOME or CUDA_PATH setting

Fixes #974

* [Bugfix] Fix CUDA home detection logic

* [Bugfix] Safely handle None cuda_home during CUDA detection

Adds a check for None before validating the CUDA home path to prevent errors when the path is not set.

* [Bugfix] Fix CUDA detection edge cases in nvhpc support (#974)

- Improved nvhpc path detection logic
- Added None check for cuda_home to avoid crashes
- Maintained existing CUDA installation compatibility

Fixes #974

* chore: rerun CI

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Co-authored-by: NaNExist <138002947+NaNExist@users.noreply.github.com>