更换wifi扫描模式，从设备获取回传Wifi列表。

app/src/main/java/com/ckkj/water/espBle/EspProvisionManager.java

@@ -325,6 +325,28 @@ public class EspProvisionManager {
         });
     }
 
+    /**
+     * 通过蓝牙请求 ESP32 扫描周围 WiFi
+     * @param scanListener 扫描结果监听器
+     */
+    public void scanWifiFromDevice(WiFiScanListener scanListener) {
+        if (!checkConnected()) {
+            if (scanListener != null) {
+                scanListener.onWiFiScanFailed(new Exception("设备未连接"));
+            }
+            return;
+        }
+
+        if (espDevice == null) {
+            if (scanListener != null) {
+                scanListener.onWiFiScanFailed(new Exception("设备实例为空"));
+            }
+            return;
+        }
+
+        espDevice.scanNetworks(scanListener);
+    }
+
     public void disconnect() {
         boolean shouldNotify = connected || connecting || provisioning;
         mainHandler.removeCallbacks(connectRetryTask);