[Feature][Model] Add Kimi K3 support for vLLM 0.27 (#14454)

### What this PR does / why we need it?

This integration PR enables Kimi K3 text, multimodal, MTP, DSpark,
Prefix Cache, and P/D serving on Ascend. The implementation is reviewed
through the atomic PRs below; this parent owns the Kimi K3 deployment
and validation guide.

### Recommended merge order

| Order | PR | Responsibility |
| ---: | --- | --- |
| 1 | #14426 | AscendC KDA, chunk gated delta rule, Dequant-SiTU, and
MX-SiTU operators |
| 2 | #14597 | Hybrid Mamba state-copy, asynchronous accepted-token
snapshots, and Ascend launch-grid correctness |
| 3 | #14598 | KDA attention execution and fused RMSNorm gate |
| 4 | #14839 | MLA attention and rotary execution |
| 5 | #14840 | Attention-residual Triton fusion |
| 6 | #14599 | SiTU MoE, shared-expert execution, and K3 ModelSlim
quantization adaptation |
| 7 | #14600 | Text, multimodal, MTP, and DSpark model registration; ViT
FIA contiguous inputs; model-owned QuaRot shared-layer conversion |
| 8 | #14601 | DSpark speculative-decoding runtime and generic
shared-layer hook integration |
| 9 | #14765 | TP8/TP16 GQA/MLA DSpark KV grouping, speculative
capacity, and per-rank DCP table sizing |
| 10 | #14602 | Hybrid P/D transfer, proxy retry, and graph-safe
stateful handoffs |

After these PRs merge, the parent-owned change is:

- `docs/source/tutorials/models/Kimi-K3.md`
- `docs/source/tutorials/models/index.md`

The guide covers reduced and full checkpoints, single-node TP16,
four-node DP4/TP16/EP64, GQA/MLA DSpark, two-node P/D, QuaRot, Prefix
Cache, server-side validation, GPQA, and performance reporting.

### How was this patch tested?

- Fused norm-gate dispatch: 39 targeted CPU tests pass (4 existing
skips) and 22 real A3 NPU numerical cases pass on each of vLLM v0.27.1
and the pinned upstream revision. Coverage includes FP16/BF16,
sigmoid/SiLU, packed gate strides, residual/prenorm, and input
preservation. The actual upstream CustomOp resolves to the Ascend fused
implementation; three ACLGraph replays with fresh inputs match upstream
native results. CI mypy and `bash format.sh ci` pass. A5 performance and
full-model serving were not rerun for this change.

- State and capacity regressions: 94 targeted CPU tests pass, with two
post-v0.27.1 coordinator-API cases skipped. Coverage includes real
InputBatch replacement/reordering, accepted-token ownership across
scheduling modes, GDN metadata, Mamba copy ordering, scheduler/worker
capacity agreement, and writes to the final speculative Mamba slots at
DCP1/DCP4. `bash format.sh ci` passes. Full-model NPU serving was not
rerun for the snapshot/capacity changes.

- Handoff graph selection: 12 CPU dispatch cases and 25 GDN metadata
tests pass. Distributed NPU end-to-end validation was not rerun for this
graph-selection change.

- All changed Python files pass syntax compilation.
- The parent includes the current child implementations plus the
deployment documentation.
- Focused coverage includes KDA, MLA, SiTU MoE, Mamba state copy,
DSpark, compressed/hybrid KV cache, Prefix Cache, one-token P/D handoff,
Mooncake transfer, and model registration.
- Full-checkpoint integration coverage includes text, multimodal, tools,
streaming, QuaRot, C64/C128, TP8/TP16, two-node P/D, four-node GQA
DSpark, the known K3 accuracy/hang cases, and GPQA-Diamond.

Detailed accuracy and performance results remain in the PR comments.

### Does this PR introduce any user-facing change?

Yes. Kimi K3 can be deployed with text, multimodal, MTP, DSpark, Prefix
Cache, and P/D serving on Ascend.

- vLLM version: v0.27.1
- vLLM main:
https://github.com/vllm-project/vllm/commit/ba07e4a48fc951300d97eb506217dd530583dea3

---------

Signed-off-by: maoxx241 <maomaoyu870@gmail.com>
Signed-off-by: weinachuan <weinachuan1@huawei.com>
Signed-off-by: zongersama <48584200+zongersama@users.noreply.github.com>
Signed-off-by: yolic66 <747731294@qq.com>
Signed-off-by: Dawn952 <zhaojunbo13@huawei.com>
Signed-off-by: MQ <maomaoyu870@gmail.com>
Co-authored-by: weinachuan <weinachuan1@huawei.com>
Co-authored-by: zongersama <48584200+zongersama@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: yolic66 <747731294@qq.com>
Co-authored-by: Dawn952 <zhaojunbo13@huawei.com>