Add CoreX BI-V150 compatibility support

[lxzlxzliuxuzhao]

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[lxzlxzliuxuzhao]

Summary

This PR adds compatibility support for CoreX BI-V150 environments.

Main changes:

• add CoreX platform detection
• support NVML-compatible memory queries through libixml.so
• improve Ray GPU resource registration on CoreX
• harden platform initialization when CUDA is available but no visible device is exposed
• adapt Megatron optimizer integration to vendor-patched signatures
• add vLLM 0.11.2 compatibility for ray distributed executor selection

Validation

Passed:

• pytest -q tests/platforms/test_platform_init.py
• pytest -q tests/platforms/test_platform_memory.py
• pytest -q tests/third_party/megatron/test_optimizer_compat.py
• pytest -q tests/third_party/vllm/test_versioning.py

Total:

• 13 passed, 17 warnings

Additionally smoke-tested on a CoreX BI-V150 machine with vendor-patched Torch / Megatron / vLLM builds.

Notes

Known limitation:

• colocated RL with vLLM sleep/offload is still not treated as a supported path on the current CoreX software stack.