refactor(translation): 优化翻译服务初始化和UI组件

改进火山翻译服务初始化逻辑，优先使用AppConfig配置并添加错误日志
调整翻译页面UI组件样式和布局，包括返回按钮图标和语言选择器

lib/data/services/volcano_translation_service.dart

@@ -9,6 +9,7 @@ import 'package:get/get.dart';
 import '../../core/utils/logger.dart';
 import 'language_manager.dart';
 
+//// 火山引擎机器翻译服务
 class VolcanoTranslationService extends GetxService {
   // API 配置
   late String _baseUrl;
@@ -28,29 +29,44 @@ class VolcanoTranslationService extends GetxService {
   VolcanoTranslationService();
 
   // 初始化服务
-  Future<bool> initialize({
+  Future<bool> initialize() async {
-    String? accessKey,
-    String? secretKey,
-    String? region,
-  }) async {
     try {
-      // final _env = _storage.read("ENV") as Map<String, String>;
+      // 优先使用后端 AppConfig，其次回退到 .env
-      _accessKey =
+      final bool appConfigReady = AppConfig.isInitialized();
-          accessKey ?? AppConfig.env('VOLCANO_TRANSLATION_ACCESS_KEY') ?? '';
+
-      _secretKey =
+      final accessKeyFromConfig = appConfigReady
-          secretKey ?? AppConfig.env('VOLCANO_TRANSLATION_SECRET_KEY') ?? '';
+          ? AppConfig.env('VOLCANO_TRANSLATION_ACCESS_KEY')
-      _region =
+          : null;
-          region ?? AppConfig.env('VOLCANO_TRANSLATION_REGION') ?? 'cn-north-1';
+      final secretKeyFromConfig = appConfigReady
+          ? AppConfig.env('VOLCANO_TRANSLATION_SECRET_KEY')
+          : null;
+      final regionFromConfig =
+          appConfigReady ? AppConfig.env('VOLCANO_TRANSLATION_REGION') : null;
+
+      _accessKey = accessKeyFromConfig ??
+          dotenv.env['VOLCANO_TRANSLATION_ACCESS_KEY'] ??
+          '';
+      _secretKey = secretKeyFromConfig ??
+          dotenv.env['VOLCANO_TRANSLATION_SECRET_KEY'] ??
+          '';
+      _region = regionFromConfig ??
+          dotenv.env['VOLCANO_TRANSLATION_REGION'] ??
+          'cn-north-1';
+
       _service = 'translate';
       _baseUrl = 'https://translate.volcengineapi.com';
 
       if (_accessKey.isEmpty || _secretKey.isEmpty) {
+        Logger.error(
+            'lxm---Volcano Translation Service initialized失败，accessKey或secretKey为空');
         return false;
       }
 
       _isInitialized = true;
+      Logger.info('lxm---Volcano Translation Service initialized成功');
       return true;
     } catch (e) {
+      Logger.error('lxm---Volcano Translation Service initialized失败，$e');
       return false;
     }
   }
@@ -142,6 +158,7 @@ class VolcanoTranslationService extends GetxService {
     required String targetLanguageCode,
   }) async {
     if (!_isInitialized) {
+      Logger.error('翻译服务未初始化');
       return null;
     }
 
@@ -246,8 +263,11 @@ class VolcanoTranslationService extends GetxService {
         return translation;
       }
 
+      Logger.error(
+          '翻译HTTP错误: status=${response.statusCode}, body=${response.body}');
       return null;
     } catch (e) {
+      Logger.error('翻译请求异常: $e');
       return null;
     }
   }

lib/modules/text_translation/views/text_translation_view.dart

@@ -49,8 +49,9 @@ class TextTranslationView extends GetView<TextTranslationController> {
       elevation: 0,
       leading: IconButton(
         icon: Icon(
-          Icons.arrow_back,
+          Icons.arrow_back_ios,
           color: isDarkMode ? Colors.white : Colors.black,
+          size: 20.sp,
         ),
         onPressed: () => Get.back(),
       ),
@@ -96,7 +97,8 @@ class TextTranslationView extends GetView<TextTranslationController> {
           Obx(() => _buildLanguageButton(
                 label: 'sourceLanguage'.tr,
                 selectedLanguage: controller.sourceLanguageChineseName.value,
-            onTap: () => controller.showLanguageSelector(isSourceLanguage: true),
+                onTap: () =>
+                    controller.showLanguageSelector(isSourceLanguage: true),
                 isDarkMode: isDarkMode,
               )),
 
@@ -128,7 +130,8 @@ class TextTranslationView extends GetView<TextTranslationController> {
           Obx(() => _buildLanguageButton(
                 label: 'targetLanguage'.tr,
                 selectedLanguage: controller.targetLanguageChineseName.value,
-            onTap: () => controller.showLanguageSelector(isSourceLanguage: false),
+                onTap: () =>
+                    controller.showLanguageSelector(isSourceLanguage: false),
                 isDarkMode: isDarkMode,
               )),
         ],
@@ -257,7 +260,9 @@ class TextTranslationView extends GetView<TextTranslationController> {
     return Obx(() => SizedBox(
           width: double.infinity,
           child: ElevatedButton(
-        onPressed: controller.isTranslating.value ? null : controller.translateText,
+            onPressed: controller.isTranslating.value
+                ? null
+                : controller.translateText,
             style: ElevatedButton.styleFrom(
               backgroundColor: Colors.blue,
               foregroundColor: Colors.white,
@@ -277,7 +282,8 @@ class TextTranslationView extends GetView<TextTranslationController> {
                         height: 20.w,
                         child: const CircularProgressIndicator(
                           strokeWidth: 2,
-                      valueColor: AlwaysStoppedAnimation<Color>(Colors.white),
+                          valueColor:
+                              AlwaysStoppedAnimation<Color>(Colors.white),
                         ),
                       ),
                       SizedBox(width: 12.w),
@@ -339,7 +345,8 @@ class TextTranslationView extends GetView<TextTranslationController> {
                 GestureDetector(
                   onTap: controller.copyResult,
                   child: Container(
-                    padding: EdgeInsets.symmetric(horizontal: 12.w, vertical: 6.h),
+                    padding:
+                        EdgeInsets.symmetric(horizontal: 12.w, vertical: 6.h),
                     decoration: BoxDecoration(
                       color: Colors.blue.withOpacity(0.1),
                       borderRadius: BorderRadius.circular(6.r),