[Platform] Add typed device feature capabilities

[TallMessiWu]

Summary

• add a typed PlatformFeature interface to DeviceMixin with a conservative unsupported default
• classify Ascend NPU SoCs into families and keep feature support in one central matrix
• expose native Gemma RMSNorm support semantically: A2/A3 supported, A5 and unknown SoCs unsupported
• cache SoC detection and safely fall back to the unknown profile when detection fails

This is a platform foundation PR stacked on #29445. It intentionally does not contain the Gemma RMSNorm operator fallback; #32745 will consume this capability after the dependency lands.

Validation

• python -m py_compile for all changed Python files
• git diff --check
• pre-commit: isort, Ruff, Black, codespell, and repository hygiene hooks passed
• target pytest was not collected on the local Windows environment because torch is unavailable
• three repository wrapper hooks could not launch on Windows (exit code 9009)

Performance / Accuracy

N/A — no runtime operator path is changed in this PR.

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CI States

Latest PR Test (Base): ❌ Run #30449930861
Latest PR Test (Extra): ❌ Run #30449930597

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.