fix(led): swap WiFi(play)/LAN(wifi+eth), LAN carrier via CLAWD_ETH_IFACE, faster alarm

- WifiLed drives play; LanLed drives wifi+eth pair (matches panel silkscreen)
- hasLanCableCarrier(): CLAWD_ETH_IFACE-only carrier when set (reliable unplug)
- LAN poll 1s; config.activated persisted for immediate setApps on boot/reconnect
- setApps double vfdOn alarm after 50ms for slow OpenVFD
- Clear activated + setSetup on credential errors
- install.sh env comment for CLAWD_ETH_IFACE

Made-with: Cursor

lib/config.js

@@ -17,6 +17,8 @@ const DEFAULTS = {
   claw_id:            null,
   token:              null,
   heartbeat_interval: 30,   // 秒
+  /** 云端已激活：用于启动/重连时立即点亮 alarm（pwr），不等首包 connected */
+  activated:          false,
 };
 
 function load() {