feat: 初始化居家上门服务系统完整项目代码

- Spring Boot 后端服务 (hss-home-service)
- delivery-miniapp 配送小程序
- website 官网 (Nuxt)
- docs 架构设计文档
- Docker 容器化部署配置

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

hss-home-service/website/composables/useScrollAnim.ts

@@ -0,0 +1,40 @@
+import { ref, onMounted, onBeforeUnmount } from 'vue'
+
+interface ScrollAnimOptions {
+  delay?: number
+  class?: string
+  threshold?: number
+}
+
+export function useScrollAnim(options: ScrollAnimOptions = {}) {
+  const { delay = 0, threshold = 0.15 } = options
+  const isVisible = ref(false)
+  let observer: IntersectionObserver | null = null
+
+  function observe(el: Element, overrides: ScrollAnimOptions = {}) {
+    const d = overrides.delay ?? delay
+    const cls = overrides.class ?? 'flow-visible'
+    observer = new IntersectionObserver(
+      (entries) => {
+        entries.forEach((entry) => {
+          if (entry.isIntersecting) {
+            setTimeout(() => {
+              entry.target.classList.add(cls)
+            }, d)
+            observer?.unobserve(entry.target)
+          }
+        })
+      },
+      { threshold }
+    )
+    observer.observe(el)
+  }
+
+  function unobserveAll() {
+    observer?.disconnect()
+  }
+
+  onBeforeUnmount(() => unobserveAll())
+
+  return { isVisible, observe, unobserve: unobserveAll }
+}