feat(led): OpenVFD sysfs (wifi+eth, alarm, play/lan), skip BT without hci

- Write /sys/class/leds/openvfd led_on/led_off (CLAWD_OPENVFD_PATH)
- WiFi product LED: wifi+eth together; SETUP/APPS -> alarm off/on
- LanLed polls hasWiredCarrier -> play; export led.lan, start/stop from client
- BT monitor only if CLAWD_DISABLE_BT unset and hci* exists (RK3528)
- Display strings remain debug-only (数码管暂不驱动)
- install.sh env template: CLAWD_DISABLE_BT, CLAWD_OPENVFD_PATH comments

Made-with: Cursor

lib/client.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const fs = require('fs');
 const { getNotifySocket } = require('./systemd-env');
 const WebSocket = require('ws');
 const { execSync, execFileSync } = require('child_process');
@@ -20,6 +21,15 @@ const PING_INTERVAL_MS    = 15_000;
 const HEARTBEAT_INTERVAL_MS = 10_000; // 心跳间隔：10 秒，用于快速感知网络状态
 const METRICS_EVERY_N     = 3;        // 每 N 次心跳采集一次指标（= 30 秒）
 
+/** CLAWD_DISABLE_BT=1 或系统无 hci* 时不启动 bluetoothctl 轮询（如 RK3528 无蓝牙） */
+function bluetoothAdapterPresent() {
+  try {
+    return fs.readdirSync('/sys/class/bluetooth').some((n) => n.startsWith('hci'));
+  } catch (_) {
+    return false;
+  }
+}
+
 class ClawClient {
   constructor() {
     this._cfg     = config.load();
@@ -165,6 +175,7 @@ class ClawClient {
     this._clearHeartbeat();
     this._clearPing();
     if (this._sdTimer) { clearInterval(this._sdTimer); this._sdTimer = null; }
+    led.lan.stop();
     if (this._btMonitor)    { this._btMonitor.stop();    this._btMonitor    = null; }
     if (this._provisionMgr) { this._provisionMgr.stop(); this._provisionMgr = null; }
     this._frpc.stop();