feat(metax): enable standalone InfiniRT graph bridge#1400
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Complete the Mars/HPCC split across build configuration, runtime loading, ATen dispatch, operator tests, and environment setup. Validate external InfiniRT prefixes, support lib64 installs, and reject standalone InfiniOps on Mars instead of mapping it back to MetaX. Resolve the active Mars flash_attn_2_cuda extension and detect its C++ ABI from exported symbols because HPCC and flash-attn are versioned independently. Pass the Mars-only attention-mask and auxiliary arguments for MHA, varlen MHA, and KV-cache while leaving the MetaX and NVIDIA signatures unchanged. Add Mars device and preload coverage, and update the build and test documentation for the separate backend.
MetaX flash-attn packages do not expose one fixed C++ signature. The MACA 3.2.1 extension appends s_aux and also passes an attention mask to mha_fwd, while the split backend assumed the standard signature and failed to import _infinicore with an undefined symbol. Reuse symbol-based ABI detection for MetaX and Mars, but map the result to independent MetaX ABI defines so Mars configuration remains isolated. Pass the optional attention-mask and auxiliary arguments only when the selected extension exports them.
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