refactor(home): 将首页组件拆分为独立模块并优化代码结构

将首页的加载动画、介绍动画和英雄区域拆分为独立的组件文件
移除index.vue中冗余的样式和逻辑，通过组件引用方式重构
优化代码组织结构，提高可维护性

app/components/home/HomeIntro.vue

@@ -0,0 +1,88 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+
+const introTitle = 'ArcticNewOne'
+const introLetters = introTitle.split('')
+
+const introRef = ref<HTMLElement | null>(null)
+const introTitleRef = ref<HTMLElement | null>(null)
+
+defineExpose({
+  introRef,
+  introTitleRef
+})
+</script>
+
+<template>
+  <div ref="introRef" class="hero-intro" aria-hidden="true">
+    <h1 ref="introTitleRef" class="hero-intro-title" :aria-label="introTitle" v-once>
+      <span class="hero-intro-word">
+        <span
+          v-for="(letter, index) in introLetters"
+          :key="`${letter}-${index}`"
+          class="hero-intro-char-wrap"
+        >
+          <span class="hero-intro-char">{{ letter }}</span>
+        </span>
+        <span class="hero-intro-tm">TM</span>
+      </span>
+    </h1>
+  </div>
+</template>
+
+<style scoped>
+.hero-intro {
+  position: fixed;
+  inset: 0;
+  z-index: 80;
+  display: grid;
+  place-items: center;
+  overflow: hidden;
+  color: #fff;
+  background: #000;
+  opacity: 0;
+  visibility: hidden;
+  will-change: transform;
+}
+
+.hero-intro-title {
+  display: flex;
+  margin: 0;
+  font-size: clamp(36px, 6.2vw, 104px);
+  font-weight: 700;
+  line-height: 0.9;
+  letter-spacing: -0.07em;
+  white-space: nowrap;
+}
+
+.hero-intro-word {
+  position: relative;
+  display: inline-flex;
+}
+
+.hero-intro-char-wrap,
+.hero-intro-char {
+  display: inline-block;
+}
+
+.hero-intro-char-wrap {
+  position: relative;
+  overflow: hidden;
+}
+
+.hero-intro-char {
+  will-change: transform;
+}
+
+.hero-intro-tm {
+  position: absolute;
+  left: calc(100% + 0.12em);
+  top: 0.08em;
+  font-size: 0.13em;
+  font-weight: 700;
+  letter-spacing: -0.02em;
+  line-height: 1;
+  opacity: 0;
+  visibility: hidden;
+}
+</style>