refactor(ui): reorder map component and simplify refresh hint

    <div class="tab-container">

      <!-- 第一个 div 根据 value 控制显示与隐藏 -->

      <div v-if="currentSelect === 'bus-location'">

        <RealtimeMapv2 v-if="showMapChart" />

        <div class="bus-location-hint" v-if="showMapChart">

          <b>位置每5秒自动刷新。</b>Location refreshes automatically every 5 seconds.<br>

          <b>位置每5秒刷新</b> Location updates every 5s<br>

        </div>

        <RealtimeMapv2 v-if="showMapChart" />

        <!-- <BusETAdemo /> -->

        <!-- <BusChartVue /> -->

      </div>