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/HomeCTA.vue

@@ -19,8 +19,7 @@
             v-for="(char, i) in line1Chars"
             :key="`l1-${i}`"
             :ref="el => setCharRef(el, 'line1', i)"
-            class="inline-block text-5xl md:text-7xl lg:text-8xl font-bold text-white"
-            style="opacity: 0; transform: translateY(100px) rotate(10deg);"
+            class="inline-block text-5xl md:text-7xl lg:text-8xl font-bold text-white char-hidden"
             v-html="char === ' ' ? ' ' : char"
           ></span>
         </div>
@@ -29,20 +28,19 @@
             v-for="(char, i) in line2Chars"
             :key="`l2-${i}`"
             :ref="el => setCharRef(el, 'line2', i)"
-            class="inline-block text-5xl md:text-7xl lg:text-8xl font-bold text-white"
-            style="opacity: 0; transform: translateY(100px) rotate(-10deg);"
+            class="inline-block text-5xl md:text-7xl lg:text-8xl font-bold text-white char-hidden"
             v-html="char === ' ' ? '&nbsp;' : char"
           ></span>
         </div>
       </h2>
 
       <!-- 副标题 -->
-      <p ref="subtitleRef" class="text-xl md:text-3xl text-white/90 mb-12 md:mb-16 leading-relaxed max-w-3xl mx-auto" style="opacity: 0;">
+      <p ref="subtitleRef" class="text-xl md:text-3xl text-white/90 mb-12 md:mb-16 leading-relaxed max-w-3xl mx-auto" >
         {{ t('home.cta.subtitle') }}
       </p>
 
       <!-- 按钮组 -->
-      <div ref="buttonsRef" class="flex flex-col sm:flex-row gap-6 justify-center items-center" style="opacity: 0;">
+      <div ref="buttonsRef" class="flex flex-col sm:flex-row gap-6 justify-center items-center" >
         <NuxtLink
           to="/contact"
           class="cta-button group relative px-10 py-5 rounded-full bg-white text-black text-lg font-bold overflow-hidden shadow-2xl hover:shadow-white/50 transition-all duration-300"
@@ -66,7 +64,7 @@
       </div>
 
       <!-- 滚动提示 -->
-      <div ref="scrollHintRef" class="absolute bottom-12 left-1/2 -translate-x-1/2" style="opacity: 0;">
+      <div ref="scrollHintRef" class="absolute bottom-12 left-1/2 -translate-x-1/2" >
         <div class="flex flex-col items-center gap-2 animate-bounce">
           <span class="text-white/70 text-sm">{{ t('home.cta.scrollDown') }}</span>
           <Icon name="ph:caret-down" class="w-6 h-6 text-white/70" />
@@ -288,4 +286,9 @@ onMounted(async () => {
 .cta-button-secondary:hover {
   transform: translateY(-2px);
 }
+
+.char-hidden {
+  opacity: 0;
+  transform: translateY(100px) rotate(10deg);
+}
 </style>