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/hooks.ts

@@ -0,0 +1,15 @@
+/**
+ * Redux Typed Hooks
+ * 提供类型安全的 useDispatch 和 useSelector hooks
+ */
+import { useDispatch, useSelector } from 'react-redux';
+import type { TypedUseSelectorHook } from 'react-redux';
+import { store } from './index';
+
+// 从 store 推断类型
+export type RootState = ReturnType<typeof store.getState>;
+export type AppDispatch = typeof store.dispatch;
+
+// 类型化的 hooks
+export const useAppDispatch: () => AppDispatch = useDispatch;
+export const useAppSelector: TypedUseSelectorHook<RootState> = useSelector;