feat(sponsor-list): implement new design with animated canvas background

This commit introduces a completely redesigned sponsor list page. The previous two-column layout is replaced with a
modern, single-column auto-scrolling list that unifies all sponsors. A dynamic canvas animation has been added to the
background for a more engaging visual experience. Previous versions of the page have been archived. This update also
includes data corrections for sponsor names and minor fixes to the related PPT assets.

20250916/ppt/templates/cover.html

@@ -1,10 +1,10 @@
 <div class="tpl-cover">
-  <div class="cover-inner container-sm">
+  <!-- <div class="cover-inner container-sm">
     <h1 class="cover-title middle">{{title}}</h1>
     <p class="cover-sub middle">{{subtitle}}</p>
     <div class="cover-date middle">{{date}}</div>
     <div class="cover-location middle">{{location}}</div>
-  </div>
+  </div> -->
 </div>
 <!-- 模板级样式会被 loader 注入到 head -->
 <!-- <link rel="stylesheet" href="/templates/cover.css" /> -->