refactor: 股票数据管理迁移到 Redux，新增类型化 Hooks

- stockSlice: 新增 loadAllStocks action（带缓存检查）
 - stockSlice: watchlist 结构升级为 { stock_code, stock_name }[]
 - store/hooks.ts: 新增 useAppDispatch, useAppSelector 类型化 hooks
 - stockService: 移除 getAllStocks（已迁移到 Redux）
 - mock: 股票搜索支持模糊匹配 + 相关性排序

src/store/index.js

@@ -63,4 +63,9 @@ export const injectReducer = (key, reducer) => {
   store.replaceReducer(createRootReducer());
 };
 
+/**
+ * @typedef {typeof store.dispatch} AppDispatch
+ * @typedef {ReturnType<typeof store.getState>} RootState
+ */
+
 export default store;