feat: add Kunlun XRE runtime support

[JoeZhang-0x000]

Summary

• Add WITH_KUNLUN, append Device::Type::kKunlun = 10 without renumbering existing devices, and generate public Kunlun headers/dispatch.
• Wrap XRE device memory, pinned host memory, copies, streams and events. Reuse native runtime/dispatch/installed-consumer tests.

Motivation

Prerequisite for InfiniOps #1001, the Kunlun RoPE backend. Neither current runtime nor operator repositories have a Kunlun backend. This replaces the runtime dependency of the closed legacy contribution InfiniCore #1574.

Type of Change

• feat — new backend capability

Platforms Affected

• Kunlun (WITH_KUNLUN)
• Build system / CMake / generated headers
• Public headers / installed consumer API

Smoke Build and Test Result

P800 OAM; XRE runtime query 5.0 (bded6e7); GCC 9.4; Python 3.10. Fresh builds from this patch:

cmake -S . -B build -DWITH_KUNLUN=ON -DWITH_CPU=ON \
  -DXRE_ROOT=/path/to/xre -DINFINI_RT_BUILD_TESTING=ON \
  -DCMAKE_BUILD_TYPE=Release
cmake --build build -j4
ctest --test-dir build --output-on-failure
# 12/12 passed, including native Kunlun runtime, dispatch,
# unsupported graph capture and installed standalone consumer.

Also built/tested Kunlun only (WITH_CPU=OFF): 11/11 passed; CPU only (WITH_KUNLUN=OFF): 10/10 passed.

Test Results on Supported Platforms

Platform/configuration	Result
Kunlun	Full ctest passed (11/11)
CPU + Kunlun	Full ctest passed (12/12)
CPU	Full ctest passed (10/10)
NVIDIA, Iluvatar, Hygon, T-Head, MetaX, Mars, Moore, Cambricon, Ascend	Hardware/SDK unavailable; existing backend implementations untouched

Benchmark / Performance Impact

N/A — prerequisite runtime support, no kernel performance claim.

Notes for Reviewers

XRE has no native memset: synchronous fills use bounded 4 KiB staging copies. Async memset/allocation, memory-info, event timing and native graph capture return XPUERR_NOSUPPORT; nonzero event flags are rejected. DeviceSynchronize waits for the default stream and runtime-created streams on the current device; callers borrowing external streams must synchronize them explicitly. Installed consumers resolve XRE via InfiniRT_KUNLUN_ROOT / XRE_ROOT. No report documents or benchmark data are committed.