feat(platform): add Ascend 910C NPU platform support
- platforms/ascend_910c.env: 8-card 910C config (16 dies, 64GB HBM/die),
Ascend Docker Runtime, ASCEND_VISIBLE_DEVICES device selection
- scripts/common/platform.sh: auto-detect 910C via npu-smi + Huawei PCI IDs
- scripts/common/npu_smi_sampler.py: standalone npu-smi -> nvidia-smi CSV
sampler so parse_backend.py needs no changes
- experiments/910c/glm52_910c_vllm_tp_dp_matrix/: GLM-5.2 (w4a8c8) experiment,
model present on host, ready for smoke after image load
- experiments/910c/dsv4_910c_vllm_tp_dp_matrix/: DSV4-Flash experiment
(placeholder MODEL_PATH, weights not yet downloaded)
- envs/ASCEND_910C_ENV_SETUP.md: full onboarding guide (permissions, image
load, Ascend Docker Runtime, NPU monitor, known pitfalls)
- Both experiments: TP2/DP4 + TP4/DP2 + TP8/DP1, matrix.json capped at 128K
context per 64GB HBM/die
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