feat(SignalR): 创建 StockHub 实现库存实时更新

wanshenmean

2026-03-30 20529bc6bc67d63c5f248fbe923558efb57a435b

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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}