Recover PR #2158 database ingest via sweep reuse / 通过扫描复用恢复 PR #2158 数据库摄取 (#2222)

* feat(kimik2.6-b300-mtp): add Kimi-K2.6 NVFP4 B300 EAGLE3 AgentX benchmark

- Add kimik2.5-fp4-b300-vllm-agentic-mtp config (runner: cluster:b300-nv)
- Add benchmark script with EAGLE3 speculative decoding (draft: lightseekorg/kimi-k2.6-eagle3-mla, num_speculative_tokens=4, synthetic_acceptance_length=3.24)
- TOKENSPEED_MLA attention backend + TRTLLM_RAGGED prefill backend
- Search space: TP8 no-offload, TP4 no-offload, TP4 native CPU-offload, TP4 DCP4 no-offload, TP4 DCP4 native CPU-offload
- Add cluster:b300-nv runner label and hardware entry
- Add spec-decoding field propagation for single-node agentic matrix
- Add perf changelog entry for PR 2158

* fix(kimik2.6-b300-mtp): use spec3/AL2.88 for DCP configs

* fix(kimik2.6-b300-mtp): align DCP vllm args with working command

* fix(changelog): omit null optional metadata

* chore: prepare PR 2158 ingest recovery

中文：准备恢复 PR #2158 的数据库摄取。

* fix: recover PR 2158 ingest

中文：通过复用扫描产物恢复 PR #2158 的数据库摄取。

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Co-authored-by: Xin Li <xinli@nvidia.com>