fix: 修复AGV任务下发，修改找空闲为深度优先等

xiazhengtongxue

2026-04-01 a9edf162ac5dd98719c2f93ab0800c98673fd220

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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}