refactor: 架构重构 - 解耦过度耦合模块

主要改动:
1. 创建乐观更新工具函数 (optimisticUpdate.ts)
   - 消除 userStore.ts 中的重复代码

2. 拆分 useResponsive.ts (485行 -> 12个专注模块)
   - useBreakpoint: 断点检测
   - useOrientation: 方向检测
   - usePlatform: 平台检测
   - useScreenSize: 屏幕尺寸
   - useResponsiveValue: 响应式值
   - useResponsiveStyle: 响应式样式
   - useMediaQuery: 媒体查询
   - useColumnCount: 列数计算
   - useResponsiveSpacing: 响应式间距

3. 整理数据层 (Repository 层)
   - ApiDataSource: API数据源
   - LocalDataSource: 本地数据源
   - CacheDataSource: 缓存数据源
   - MessageRepository: 消息仓库

4. 重构 messageManager.ts (2194行 -> 4个模块)
   - MessageStateManager: 状态管理
   - WebSocketMessageHandler: WebSocket处理
   - MessageSyncService: 消息同步
   - ReadReceiptManager: 已读管理

5. 导航解耦 (MainNavigator.tsx: 1118行 -> 100行)
   - 创建 NavigationService 解耦层
   - 拆分多个 Navigator 组件

架构改进:
- 单一职责原则: 每个模块职责明确
- 依赖倒置: 通过接口解耦
- 代码复用: 工具函数可被多处使用
- 可测试性: 各模块可独立测试

src/data/datasources/interfaces.ts

@@ -0,0 +1,64 @@
+/**
+ * 数据源接口定义
+ * 定义所有数据源的标准接口，便于替换和测试
+ */
+
+// API 数据源接口
+export interface IApiDataSource {
+  get<T>(url: string, params?: any): Promise<T>;
+  post<T>(url: string, data?: any): Promise<T>;
+  put<T>(url: string, data?: any): Promise<T>;
+  delete<T>(url: string, data?: any): Promise<T>;
+  upload<T>(url: string, file: { uri: string; name: string; type: string }, additionalData?: Record<string, string>): Promise<T>;
+}
+
+// 本地数据源接口 (SQLite)
+export interface ILocalDataSource {
+  query<T>(sql: string, params?: any[]): Promise<T[]>;
+  getFirst<T>(sql: string, params?: any[]): Promise<T | null>;
+  execute(sql: string, params?: any[]): Promise<void>;
+  run(sql: string, params?: any[]): Promise<{ lastInsertRowId: number; changes: number }>;
+  transaction(operations: () => Promise<void>): Promise<void>;
+  batch(operations: (db: ILocalDataSource) => Promise<void>): Promise<void>;
+}
+
+// 缓存数据源接口
+export interface ICacheDataSource {
+  get<T>(key: string): Promise<T | null>;
+  set<T>(key: string, value: T, ttl?: number): Promise<void>;
+  delete(key: string): Promise<void>;
+  clear(): Promise<void>;
+  has(key: string): Promise<boolean>;
+  getMultiple<T>(keys: string[]): Promise<(T | null)[]>;
+  setMultiple<T>(entries: { key: string; value: T; ttl?: number }[]): Promise<void>;
+}
+
+// 数据源错误类型
+export class DataSourceError extends Error {
+  constructor(
+    message: string,
+    public code: string,
+    public source: string,
+    public originalError?: Error
+  ) {
+    super(message);
+    this.name = 'DataSourceError';
+  }
+}
+
+// 数据源配置
+export interface DataSourceConfig {
+  api?: {
+    baseUrl: string;
+    timeout?: number;
+    retryCount?: number;
+  };
+  local?: {
+    dbName: string;
+    version: number;
+  };
+  cache?: {
+    maxSize: number;
+    defaultTtl: number;
+  };
+}