docs: 添加 TaskService 重构设计文档

wanshenmean

2026-03-31 96c9142944da3b9f6ebfc63e17451b9b330e5a72

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{"t":0,"agent":"a1dd170","agent_type":"unknown","event":"agent_stop","success":true}
{"t":0,"agent":"a5ca246","agent_type":"unknown","event":"agent_stop","success":true}