fix: 修复首页加载和动画时序问题

🐛 问题修复:
- 移除所有新板块的初始 opacity: 0 样式
- 防止新板块初始隐藏导致黑屏问题
- 确保页面加载后内容立即可见
- 修复菜单延迟出现的问题

🎨 优化调整:
- 改用 CSS class 控制动画初始状态
- ScrollTrigger 动画在滚动到对应位置时才触发
- 不影响首屏 Hero 和 Intro 的加载动画
- 保持所有板块的入场动画效果

✅ 修复的组件:
- HomeServices
- HomeAchievements
- HomeTestimonials
- HomeTechStack
- HomeProcess
- HomeUpdates
- HomeCTA

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/components/home/HomeProcess.vue

@@ -2,7 +2,7 @@
   <section ref="rootRef" class="relative bg-gradient-to-b from-white to-gray-50 min-h-screen flex flex-col items-center justify-center overflow-hidden py-20">
     <div class="w-full max-w-[1400px] mx-auto px-6 md:px-10">
       <!-- 标题 -->
-      <div ref="headerRef" class="text-center mb-16 md:mb-20" style="opacity: 0;">
+      <div ref="headerRef" class="text-center mb-16 md:mb-20">
         <h2 class="text-5xl md:text-7xl font-bold tracking-tight text-black mb-6">
           {{ t('home.process.title') }}
         </h2>
@@ -17,7 +17,7 @@
         <svg
           ref="lineRef"
           class="absolute top-1/2 left-0 w-full h-1 -translate-y-1/2 pointer-events-none z-0"
-          style="opacity: 0;"
+         
         >
           <path
             ref="linePathRef"
@@ -44,7 +44,7 @@
             :key="step.id"
             :ref="el => setStepRef(el, index)"
             class="process-step flex-shrink-0 w-[280px] md:w-[320px]"
-            style="opacity: 0;"
+           
           >
             <!-- 步骤编号节点 -->
             <div class="relative flex justify-center mb-8">