fix: wait for NM auto-reconnect before starting AP on reboot

After WiFi is configured and device reboots, NetworkManager needs
a few seconds to auto-connect to saved WiFi. Without waiting,
AP starts immediately and occupies wlan0, preventing NM reconnect.

- Add hasSavedWifiConnection() to check for saved WiFi profiles
- Wait up to 20s for NM auto-connect before falling back to AP
- First boot (no saved WiFi) still starts AP immediately

Made-with: Cursor

lib/client.js

@@ -60,21 +60,25 @@ class ClawClient {
   async start() {
     log.info('clawd', `启动中... 服务器 = ${this._cfg.server}`);
 
-    // 后台启动 AP 配网管理器（WiFi 未连接时常驻热点）
+    // 启动 AP 配网管理器（等待已保存 WiFi 自动连接，超时再开 AP）
     this._provisionMgr = new ProvisionManager(this._cfg.claw_id);
-    this._provisionMgr.start();
 
-    // 有网络时直接连接云端
-    if (hasInternet()) {
-      await this._proceedWithConnection();
-    } else {
-      // 等待配网完成后再连
-      log.info('clawd', '等待网络就绪...');
-      this._provisionMgr.once('network-ready', () => {
+    // 网络就绪时连接云端
+    this._provisionMgr.once('network-ready', () => {
+      if (!this._ws) {
         this._proceedWithConnection().catch(e => {
           log.error('clawd', '连接启动失败:', e.message);
         });
-      });
+      }
+    });
+
+    await this._provisionMgr.start();
+
+    // start() 返回后，如果已有网络，直接连
+    if (hasInternet() && !this._ws) {
+      await this._proceedWithConnection();
+    } else if (!hasInternet()) {
+      log.info('clawd', '等待网络就绪（WiFi 配网或网线接入）...');
     }
   }