Epic: TanStack Query 数据服务改造 #56
Description
目标
引入 TanStack Query 实现推送式数据服务，解决 Tab 切换重复请求问题。
子任务
- feat: introduce TanStack Query for push-based data updates #43 引入 TanStack Query 基础设施
- feat: migrate useTransactionHistory to TanStack Query #44 Transaction History Query
- feat: migrate usePriceService to TanStack Query #45 Price Query
- feat: migrate useExchangeRate to TanStack Query #46 Exchange Rate Query
- feat: migrate Staking queries to TanStack Query #47 Staking Queries
- feat: migrate chain config subscription to TanStack Query #48 Chain Config Query
- feat: migrate notifications to TanStack Query #49 Notifications (已关闭，使用本地 store)