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/network.js

@@ -62,6 +62,22 @@ function hasWiredCarrier() {
   return getWiredIfaceWithCarrier() !== null;
 }
 
+/**
+ * LAN 面板灯专用：若设置 CLAWD_ETH_IFACE，只认该口 carrier（拔网线必灭）；
+ * 未设置时退回 hasWiredCarrier()（可能受其它网口影响，建议在 box 上配置 end0 等）。
+ */
+function hasLanCableCarrier() {
+  const explicit = process.env.CLAWD_ETH_IFACE;
+  if (explicit) {
+    try {
+      return fs.readFileSync(`/sys/class/net/${explicit}/carrier`, 'utf8').trim() === '1';
+    } catch (_) {
+      return false;
+    }
+  }
+  return hasWiredCarrier();
+}
+
 function _tryPingInternet() {
   try {
     run('ping -c 1 -W 3 8.8.8.8');
@@ -312,6 +328,7 @@ function getLocalIps() {
 module.exports = {
   hasInternet,
   hasWiredCarrier,
+  hasLanCableCarrier,
   hasWiredInternetProbe,
   getWiredIfaceWithCarrier,
   hasSavedWifiConnection,