[Feature]: 建议支持qwen3.5 chat reasoning字段解析

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**Is your feature request related to a problem? Please describe.**
vllm0.17.1 参数如下："--model",
"/home/share/model/Qwen3.5-35B-A3B",
"--served-model-name",
"qwen3.5",
"--tensor-parallel-size=2",
"--enable-auto-tool-choice",
"--tool-call-parser",
"qwen3_coder",
"--mm-encoder-tp-mode",
"data",
"--mm-processor-cache-type",
"shm",
"--reasoning-parser",
"qwen3",
"--enable-prefix-caching"
输出的reasoning内容在reasoning字段，而不是reasoning_content字段，导致输出的思考内容为空，希望添加对reasoning字段的支持

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