feat(web): use history routing and preserve scroll on filter changes

reaction_board/web/static/views/up.js

@@ -35,7 +35,7 @@ export async function renderUp(root, { params, query }) {
 
   root.innerHTML = `<section class="page up-page">
     <header class="page-head">
-      <a class="back-link" href="#/rank?scope=up&sort=avg_views">← 返回 UP 榜</a>
+      <a class="back-link" href="/rank?scope=up&sort=avg_views">← 返回 UP 榜</a>
       <a class="button ghost" href="${escapeAttr(up.space_url)}" target="_blank" rel="noreferrer">B 站空间</a>
     </header>