refactor(translation): 将分页加载状态移至历史管理器

简化翻译控制器的状态管理，将分页加载相关状态移至历史管理器统一管理

lib/modules/translation/controllers/translation_controller.dart

@@ -68,11 +68,7 @@ class TranslationController extends GetxController {
   static const String _targetLanguageKey = 'translation_target_language';
 
   // 分页加载相关状态
-  final isLoadingMore = false.obs; // 是否正在加载更多历史记录
-  final hasMoreHistory = true.obs; // 是否还有更多历史记录
-  final currentPage = 1.obs; // 当前页码
   final pageSize = 20; // 每页记录数量
-  final isLoadingMoreError = false.obs; // 加载更多时是否出错
   bool _scrollListenerSetup = false; // 滚动监听器设置标志
 
   RxInt activeSpeaker = 0.obs; // 0=无激活, 1=按钮1, 2=按钮2
@@ -110,6 +106,10 @@ class TranslationController extends GetxController {
   RxList<TranslationItem> get translationHistory =>
       _historyManager.translationHistory;
   ScrollController get scrollController => _historyManager.scrollController;
+  // 添加历史管理器状态访问器
+  RxBool get hasMoreHistory => _historyManager.hasMoreHistory;
+  RxBool get isLoadingMore => _historyManager.isLoadingMore;
+  RxBool get isLoadingMoreError => _historyManager.isLoadingMoreError;
   // 其他
   StreamSubscription? _recognitionSubscription;
   StreamSubscription? _voiceInteractionSubscription;