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 Previous versions of the page have been archived.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/config/banquet.json

@@ -1,16 +1,10 @@
 {
-  "manifest": "/templates/manifest.json",
+  "manifest": "./templates/manifest.json",
   "slides": [
     {
       "type": "cover",
       "template": "cover",
-      "data": {
-        "title": "柔佛永平关圣公联谊会",
-        "subtitle": "筹募活动基金联欢晚会",
-        "date": "2025年9月16日",
-        "location": "永平富华冷气酒家"
-      },
-      "background": "https://picsum.photos/1920/1080?grayscale"
+      "background": "./images/Background.jpg"
     },
     {
       "type": "speech",
@@ -22,7 +16,7 @@
         "avatar": "images/林添顺.jpg",
         "bio": "马华公会（MCA）领袖，现任柔佛州永平区州议员兼州行政议会卫生及环境委员会主席。青年政治人物，积极推动民生与公共服务改善，关注教育、环境及社区发展。"
       },
-      "background": "https://picsum.photos/1920/1080?grayscale&random=1",
+      "background": "./images/blank.jpg",
       "overrideCss": "overrides/zhanghua.css"
     },
     {
@@ -34,7 +28,7 @@
         "avatar": "images/关圣公致辞2.jpg",
         "bio": "嘉宾介绍"
       },
-      "background": "https://picsum.photos/1920/1080?grayscale&random=2",
+      "background": "./images/blank.jpg",
       "overrideCss": "overrides/limei.css"
     }
   ]

20250916/ppt/templates/cover.css

@@ -3,7 +3,7 @@
   height: 100%;
   display: flex;
   position: relative;
-  background: linear-gradient(rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0.45));
+  /* background: linear-gradient(rgba(0, 0, 0, 0.45), rgba(0, 0, 0, 0.45)); */
 }
 
 .cover-inner {

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" /> -->

20250916/ppt/templates/speech.css

@@ -17,8 +17,9 @@
   width: 90%;
   box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 215, 0, 0.1);
   border: 1px solid rgba(255, 255, 255, 0.08);
-  position: relative;
+  position: absolute;
   overflow: hidden;
+  top: 50%;
 }
 
 .speech-card::before {