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

install.sh

@@ -171,6 +171,8 @@ CLAWD_LOG_FILE=1
 # CLAWD_DISABLE_BT=1
 # OpenVFD sysfs 根路径（默认 /sys/class/leds/openvfd）
 # CLAWD_OPENVFD_PATH=/sys/class/leds/openvfd
+# LAN 灯跟 carrier：务必设为实际以太网口（如 end0），拔网线才能可靠熄灭
+# CLAWD_ETH_IFACE=end0
 EOF
   info "环境变量文件已创建：$ENV_FILE ✓"
 fi