feat: support Iluvatar graph runtime

[gongchensu]

Summary

• Add Iluvatar stream capture and graph replay support to src/native/cuda/iluvatar/runtime_.h.
• Enable test_iluvatar_graph to validate graph capture, instantiation, repeated replay, and resource cleanup.

Motivation

Iluvatar graph runtime support was removed in #25 because it had not been
validated on physical hardware. InfiniLM graph execution requires these runtime
bindings for graph capture and replay.

This change restores the capability after validation on Iluvatar BI-V150 with
CoreX 4.5 and BI-V200 with CoreX 1.2.

Follow-up to #25.

Type of Change

• feat - new feature / new backend capability / new public API
• fix - bug fix
• perf - performance improvement without behavior change
• refactor - code restructuring without behavior change
• test - adding or fixing tests only
• docs - documentation only
• build / ci - build system or CI configuration
• chore - tooling, formatting, or other non-code changes
• Breaking change (requires a ! in the Conventional Commits prefix or a BREAKING CHANGE: footer)

Platforms Affected

• CPU (WITH_CPU)
• NVIDIA (WITH_NVIDIA)
• Iluvatar (WITH_ILUVATAR)
• Hygon (WITH_HYGON)
• MetaX (WITH_METAX)
• Moore (WITH_MOORE)
• Cambricon (WITH_CAMBRICON)
• Ascend (WITH_ASCEND)
• Build system / CMake / generated headers
• Public headers / installed consumer API
• Documentation only

Smoke Build and Test Result

paste smoke build and test output here

Test Results on Supported Platforms

Platform	Affected	Build / Smoke Result	Full Result / Notes
CPU
NVIDIA
Iluvatar
Hygon
MetaX
Moore
Cambricon
Ascend

Full `ctest` output (optional)

paste here

Benchmark / Performance Impact

Notes for Reviewers