feat: 新增全局搜索功能，优化页面默认跳转逻辑

1. 新增全局搜索弹窗组件及相关事件常量
2. 修复首页默认跳转路径，改回首页而非动态页
3. 注释无用的单例运行代码
4. 添加背景模糊样式类
5. 更新搜索API类型定义
6. 底部导航栏搜索按钮触发全局搜索弹窗

src/tabbar/index.vue

@@ -5,6 +5,7 @@ import { setTabbarItem } from './i18n'
 import { tabbarList, tabbarStore } from './store'
 import { sleep } from '@/utils/common'
 import { debounce } from '@/utils/base/debounce'
+import { GLOBAL_SEARCH_EVENT_NAME } from '@/constants/events'
 import TabbarItem from './TabbarItem.vue'
 
 // #ifdef MP-WEIXIN
@@ -132,6 +133,10 @@ function handleScrollToTop() {
     duration: 300,
   })
 }
+
+function handleShowGlobalSearch() {
+  uni.$emit(GLOBAL_SEARCH_EVENT_NAME)
+}
 </script>
 
 <template>
@@ -159,7 +164,7 @@ function handleScrollToTop() {
         class="uh-shadow-sm uh-backdrop-blur box-border h-54px w-54px flex items-center justify-center border border-white rounded-full border-solid bg-white/95 text-2xl"
       >
         <wd-icon v-if="backTopActive.show" name="arrow-up" :size="22" @click="handleScrollToTop" />
-        <wd-icon v-else name="search-line" :size="22" />
+        <wd-icon v-else name="search-line" :size="22" @click="handleShowGlobalSearch()" />
       </view>
 
       <view v-if="!tabBarConfig.useFloat" class="pb-safe" />