feat(about): 添加pattern遮罩层提升视觉效果

在关于页面背景中添加pattern遮罩层，增强页面视觉层次感

pages/about.vue

@@ -85,6 +85,8 @@
         >
           <!-- 商务风格背景图 -->
           <div class="absolute inset-0 bg-business-overlay"></div>
+          <!-- 添加pattern遮罩层 -->
+          <div class="absolute inset-0 bg-[url('~/assets/images/pattern.png')] bg-[100px_100px] bg-repeat"></div>
           <div class="absolute inset-0 bg-gradient-to-b from-black/70 via-black/50 to-black/70"></div>
           <div class="max-w-screen-2xl mx-auto px-4 sm:px-6 lg:px-8 relative z-10">
             <div class="text-center mb-32 animate-fade-in">