fix(home): 替换首页顶部图片为语义化命名的资源文件

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

@@ -6,7 +6,7 @@
       <image
         v-if="!headerImageError"
         class="w-full h-full"
-        src="https://cdn.ipadbiz.cn/manulife/images/iwEeAqNwbmcDAQTRBGUF0QMwBrBn6x1ac5y9nAllf7fKAXkAB9IHbb6MCAAJomltCgAL0gAYx7U.png?imageMogr2/thumbnail/300x/strip/quality/90"
+        src="https://cdn.ipadbiz.cn/manulife/images/manulife-top-bg.png?imageMogr2/thumbnail/300x/strip/quality/90"
         mode="aspectFill"
         @error="handleHeaderImageError"
       />