feat: 重构应用加载流程和动画管理

- 新增 AppLoader 组件作为全局加载器
- 引入 Pinia 状态管理应用加载状态
- 创建 usePageScrollLock 组合式函数管理滚动锁定
- 重构首页动画流程，使用 Promise 链式调用
- 移除旧的 HomeLoader 组件
- 优化头部导航栏的入场动画触发逻辑

app/components/home/HomeIntro.vue

@@ -1,16 +1,49 @@
 <script setup lang="ts">
-import { ref } from 'vue'
+import { ref, onBeforeUnmount } from 'vue'
+import gsap from 'gsap'
 
 const introTitle = 'ArcticNewOne'
 const introLetters = introTitle.split('')
-
 const introRef = ref<HTMLElement | null>(null)
 const introTitleRef = ref<HTMLElement | null>(null)
+let ctx: gsap.Context | null = null
 
-defineExpose({
-  introRef,
-  introTitleRef
+const play = () => new Promise<void>((resolve) => {
+  if (!introRef.value || !introTitleRef.value) return resolve()
+
+  const chars = gsap.utils.toArray('.hero-intro-char', introRef.value)
+  const tm = introRef.value.querySelector('.hero-intro-tm')
+
+  if (!chars.length || !tm) return resolve()
+
+  ctx = gsap.context(() => {
+    // 初始化样式
+    gsap.set(introRef.value, { display: 'grid', yPercent: 0, autoAlpha: 1 })
+    gsap.set(introTitleRef.value, { y: 0, autoAlpha: 1 })
+    gsap.set(chars, { y: 0, yPercent: 110 })
+    gsap.set(tm, { autoAlpha: 0 })
+
+    gsap.timeline({
+      defaults: { ease: 'power3.out' },
+      onComplete: () => {
+        gsap.set(introRef.value, { display: 'none' })
+        resolve()
+      }
+    })
+      // 逐字升起
+      .to(chars, { yPercent: 0, duration: 0.75, stagger: 0.055 })
+      // TM 渐显
+      .to(tm, { autoAlpha: 1, duration: 0.4, ease: 'power2.out' })
+      // 停顿 0.35s 后，整体上移并淡出标题
+      .addLabel('introOut', '+=0.35')
+      .to(introTitleRef.value, { autoAlpha: 0, duration: 1.05, ease: 'power4.inOut' }, 'introOut')
+      .to(introRef.value, { yPercent: -100, duration: 1.05, ease: 'power4.inOut' }, 'introOut')
+  }, introRef.value)
 })
+
+onBeforeUnmount(() => ctx?.revert())
+
+defineExpose({ play })
 </script>
 
 <template>
@@ -35,7 +68,7 @@ defineExpose({
   position: fixed;
   inset: 0;
   z-index: 80;
-  display: grid;
+  display: none;
   place-items: center;
   overflow: hidden;
   color: #fff;