feat(article detail): add back-to-top button and scroll mixin

add the to-top component and integrate scroll mixin to support scroll-to-top functionality

pages_tool/article/detail.vue

@@ -19,12 +19,15 @@
 
 		<!-- 隐私弹窗 -->
 		<privacy-popup ref="privacyPopup"></privacy-popup>
+		<to-top v-if="showTop" @toTop="scrollToTopNative()"></to-top>
 	</view>
 </template>
 
 <script>
 	import htmlParser from '@/common/js/html-parser';
+	import scroll from '@/common/js/scroll-view.js';
 	export default {
+		mixins: [scroll],
 		data() {
 			return {
 				articleId: 0,