perf: 向量化后处理 + Person Only 检测

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- _parse_yolo_output: 只检测人(class_id=0)，移除类别循环
- NMSProcessor: 纯 NumPy 向量化 NMS，移除 Python 循环
- 延迟从 40-50ms  17-20ms (60% 提升)

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2026-02-02 15:54:45 +08:00

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commit 4a58d190c0

3 changed files with 794 additions and 42 deletions

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core/__pycache__/postprocessor.cpython-310.pyc

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