fix(overview): 今日更新包数卡片跳转检索页时只显示今日更新

概览卡片点击改为 /search?updatedToday=1，检索页按
北京时间 today 过滤 lastUpdated，工具栏显示「仅今日更新」
标签并支持一键清除。

frontend/src/views/OverviewView.vue

@@ -84,7 +84,7 @@ function quickClean() {
 
     <!-- 第二行：辅助指标 5 -->
     <div class="stats-2">
-      <StatMini tone="blue" label="今日更新包数" ico="🆕" :main="String(stats.todayUpdated)" sub="今日有版本更新" link="查看" @link="router.push('/search')" />
+      <StatMini tone="blue" label="今日更新包数" ico="🆕" :main="String(stats.todayUpdated)" sub="今日有版本更新" link="查看" @link="router.push({ path: '/search', query: { updatedToday: 1 } })" />
       <StatMini tone="green" label="缓存版本总数" ico="🧩" :main="stats.totalVersions.toLocaleString()" sub="全部缓存包的版本数" link="查看" @link="router.push('/search')" />
       <StatMini tone="orange" label="最大包" ico="🐘" :main="stats.maxPkg?.name || '—'" :unit="stats.maxPkg ? fmtSize(stats.maxPkg.size) : ''" :sub="`${stats.maxPkg?.versions || 0} 个版本`" link="详情" @link="stats.maxPkg && openDrawer(stats.maxPkg)" />
       <StatMini tone="purple" label="最老包时间" ico="⏳" :main="stats.oldestPkg?.lastUpdated || '—'" unit="⏰" :sub="stats.oldestPkg ? `${stats.oldestPkg.name} · 未更新` : ''" link="详情" @link="stats.oldestPkg && openDrawer(stats.oldestPkg)" />

frontend/src/views/SearchView.vue

@@ -1,6 +1,6 @@
 <script setup>
 import { ref, computed, watch, onMounted, onUnmounted } from 'vue'
-import { useRoute } from 'vue-router'
+import { useRoute, useRouter } from 'vue-router'
 import PackageDrawer from '../components/PackageDrawer.vue'
 import CleanDialog from '../components/CleanDialog.vue'
 import StatusTag from '../components/StatusTag.vue'
@@ -9,6 +9,7 @@ import { useStore, fmtSize } from '../store'
 
 const { state, stats, refreshPackages, ignorePkg, unignorePkg, cleanPkg, deleteVersion } = useStore()
 const route = useRoute()
+const router = useRouter()
 
 const keyword = ref('')
 const statusFilter = ref('all') // all | warn | ok | ignored | broken
@@ -16,6 +17,17 @@ const sortMode = ref('default') // default | versions-desc | size-desc | date-de
 const isMobile = ref(false)
 let debounceTimer = null
 
+// —— 今日更新筛选（从概览「今日更新包数」卡片跳转进入） ——
+// 与后端 lastUpdated 同口径：北京时间 YYYY-MM-DD
+const todayStr = new Intl.DateTimeFormat('en-CA', {
+  timeZone: 'Asia/Shanghai', year: 'numeric', month: '2-digit', day: '2-digit',
+}).format(new Date())
+const todayFilter = ref(false)
+function clearTodayFilter() {
+  todayFilter.value = false
+  router.replace({ path: '/search' })
+}
+
 // —— 响应式 placeholder：移动端精简，桌面端完整 ——
 function checkMobile() {
   isMobile.value = window.matchMedia('(max-width: 767px)').matches
@@ -78,6 +90,7 @@ onMounted(() => {
   if (route.query.status && ['all', 'warn', 'ok', 'ignored', 'broken'].includes(route.query.status)) {
     statusFilter.value = route.query.status
   }
+  if (route.query.updatedToday === '1') todayFilter.value = true
 })
 onUnmounted(() => {
   document.removeEventListener('click', closeMenus)
@@ -91,6 +104,7 @@ watch(keyword, () => {
 
 const filtered = computed(() => {
   let list = state.packages
+  if (todayFilter.value) list = list.filter(p => p.lastUpdated === todayStr)
   if (statusFilter.value !== 'all') {
     list = list.filter(p => p.status === statusFilter.value)
   }
@@ -179,6 +193,7 @@ async function onCleanConfirmed(res) {
       <div class="tb-count">
         共找到 <b>{{ filtered.length }}</b> 个包
         <template v-if="keyword">（关键词「{{ keyword }}」）</template>
+        <template v-if="todayFilter">（<span class="today-chip">仅今日更新 {{ todayStr }} <i @click="clearTodayFilter" title="清除筛选">✕</i></span>）</template>
       </div>
       <div class="tb-actions">
         <div class="dd">
@@ -385,6 +400,22 @@ async function onCleanConfirmed(res) {
   white-space: nowrap;
 }
 .tb-count b { color: var(--orange); }
+.today-chip { color: var(--orange); font-weight: 600; }
+.today-chip i {
+  display: inline-grid;
+  place-items: center;
+  width: 15px;
+  height: 15px;
+  border-radius: 50%;
+  background: var(--orange-soft);
+  color: var(--orange);
+  font-style: normal;
+  font-size: 9px;
+  cursor: pointer;
+  margin-left: 4px;
+  vertical-align: 1px;
+}
+.today-chip i:hover { background: var(--orange); color: #fff; }
 .tb-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
 .dd { position: relative; }
 .dd-btn {