fix: 替换已弃用的 getSystemInfoSync API 并优化移动端布局

- 将所有 uni.getSystemInfoSync() 替换为新的推荐 API
  - uni.getDeviceInfo() 获取设备信息
  - uni.getWindowInfo() 获取窗口信息
  - uni.getAppBaseInfo() 获取应用基础信息
- 优化页面布局适配移动端小程序
  - page 添加 height: 100% 和 overflow: hidden
  - 主页面使用 height: 100vh 替代 min-height
  - 移除滚动条显示（::-webkit-scrollbar）
  - 添加 flex-shrink: 0 防止卡片收缩
- 修复隐藏滚动条，提升移动端体验

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mini-program/src/pages/splash/index.vue

@@ -24,9 +24,10 @@ const statusBarHeight = ref(20)
 const safeAreaBottom = ref(0)
 
 onLoad(() => {
-  const systemInfo = uni.getSystemInfoSync()
-  statusBarHeight.value = systemInfo.statusBarHeight || 20
-  safeAreaBottom.value = systemInfo.safeAreaInsets?.bottom || 0
+  // 使用新的推荐 API 替代已弃用的 getSystemInfoSync
+  const windowInfo = uni.getWindowInfo()
+  statusBarHeight.value = windowInfo.statusBarHeight || 20
+  safeAreaBottom.value = windowInfo.safeAreaInsets?.bottom || 0
   setTimeout(async () => {
     const store = useAppStore()
     const token = uni.getStorageSync('access_token')