feat(infrastructure): add pagination, cache, and sync infrastructure

- Add pagination infrastructure with usePagination and usePaginationManager hooks
- Add connection state management hook for network status tracking
- Add media caching infrastructure with useMediaCache hook
- Add differential message synchronization infrastructure
- Export new hooks from central index file
- Remove backup file MainNavigator.tsx.bak

src/infrastructure/diff/index.ts

@@ -0,0 +1,40 @@
+/**
+ * 差异更新模块
+ * 提供消息列表的增量更新功能，减少 UI 重渲染次数
+ */
+
+// 类型定义
+export {
+  MessageUpdateType,
+  MessageIdentifier,
+  BaseMessageUpdate,
+  AddMessageUpdate,
+  UpdateMessageUpdate,
+  DeleteMessageUpdate,
+  MoveMessageUpdate,
+  BatchAddMessageUpdate,
+  BatchUpdateMessageUpdate,
+  BatchDeleteMessageUpdate,
+  ResetMessageUpdate,
+  MessageUpdate,
+  DiffConfig,
+  DiffResult,
+  BatchUpdateListener,
+  MessageComparator,
+  MessageSorter,
+  DEFAULT_DIFF_CONFIG,
+} from './types';
+
+// 差异计算器
+export {
+  MessageDiffCalculator,
+  createMessageDiffCalculator,
+} from './MessageDiffCalculator';
+
+// 批量处理器
+export {
+  MessageUpdateBatcher,
+  createMessageUpdateBatcher,
+  BatcherOptions,
+  DEFAULT_BATCHER_OPTIONS,
+} from './MessageUpdateBatcher';