fix(ota_upgrade): 更新耳机图片资源并修复版本检查逻辑

更新暗黑模式和明亮模式下的耳机图片资源
修复版本检查逻辑，使用产品版本作为最新版本

lib/modules/ota_upgrade/controllers/ota_upgrade_controller.dart

@@ -209,12 +209,12 @@ class OtaUpgradeController extends GetxController {
 
       // final resp = OtaConfigResp.fromJson(response);
       // Logger().d('getequipmentinfo,resp.systemversion: ${resp.systemversion}');
-      // latestVersion.value = resp.systemversion!;
+      latestVersion.value = product?.version ?? "";
       // updatedescription.value = resp.updatedescription!;
       updatepackageaddress = product!.updatepackageaddress!;
 
       // 版本检查
-      bool isUpdate = _isNewVersionAvailable(product!.version!);
+      bool isUpdate = _isNewVersionAvailable(product.version!);
 
       if (isUpdate) {
         await _bleManager.setEnterOta(true);

lib/modules/ota_upgrade/views/ota_upgrade_view.dart

@@ -187,8 +187,8 @@ class OtaUpgradeView extends GetView<OtaUpgradeController> {
       ),
       child: Image.asset(
         isDarkMode
-            ? 'assets/images/headphone_dark.png'
-            : 'assets/images/headphone_light.png',
+            ? 'assets/images/headphone_new3.png'
+            : 'assets/images/headphone_new4.png',
         height: 100.h,
         fit: BoxFit.contain,
       ),