feat(link): DeviceLink 外壳单例统一 ESP32/ECAT/BLE 健康态
各页只共用 IP、各自 fetch 导致同屏「已连接/连接失败」分裂。 外壳 Owner 轮询 /system/status 与 EtherCAT 状态,BroadcastChannel 广播快照;连接灯只认共享层,SPI 失败单独文案不覆盖设备离线。
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@@ -179,5 +179,8 @@
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<!-- app 窗口租约: 本外壳窗口活着期间保持与本地服务的连接,
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全部窗口关闭后服务端自动停 EtherCAT PDO 循环(见 js/common/app-lease.js) -->
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<script src="js/common/app-lease.js"></script>
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<!-- DeviceLink Owner:全链路健康轮询只在本外壳跑一次,各 iframe 订阅 -->
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<script>window.__dcuDeviceLinkOwner = true;</script>
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<script type="module" src="js/common/device-link.js?v=20260916a"></script>
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</body>
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</html>
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