fix: speed up usage activity heatmap render

frontend/src/components/stats/ActivityHeatmap.vue

@@ -410,17 +410,10 @@ function buildTooltip(day: ActivityHeatmapDay): string {
   return parts.join(' · ')
 }
 
-// 生成完全随机的动画延迟，每个格子独立随机弹出
-const cellDelayMap = new Map<string, number>()
-
 function getCellAnimationDelay(weekIndex: number, dayIndex: number) {
-  const key = `${weekIndex}-${dayIndex}`
+  const delay = Math.min(120, weekIndex * 2 + dayIndex * 4)
-  if (!cellDelayMap.has(key)) {
-    // 完全随机延迟，范围 0-800ms
-    cellDelayMap.set(key, Math.random() * 800)
-  }
   return {
-    animationDelay: `${cellDelayMap.get(key)}ms`
+    animationDelay: `${delay}ms`
   }
 }
 </script>
@@ -428,7 +421,7 @@ function getCellAnimationDelay(weekIndex: number, dayIndex: number) {
 <style scoped>
 .cell-emerge {
   opacity: 0;
-  animation: cellEmerge 0.35s ease-out forwards;
+  animation: cellEmerge 0.18s ease-out forwards;
 }
 
 @keyframes cellEmerge {

frontend/src/views/shared/Usage.vue

@@ -799,7 +799,11 @@ onMounted(async () => {
   document.addEventListener('visibilitychange', handleVisibilityChange)
 
   if (isAdminPage.value) {
-    // 管理员页面优先加载记录，统计面板在后台顺序刷新，避免瞬时并发打满后端。
+    // 管理员页面优先启动热力图加载，避免被统计聚合链路阻塞。
+    const heatmapPromise = loadHeatmapData().catch(err => {
+      log.error('加载热力图数据失败:', err)
+    })
+
     await loadRecords(
       { page: currentPage.value, pageSize: pageSize.value },
       getCurrentFilters(),
@@ -807,7 +811,7 @@ onMounted(async () => {
     )
     void (async () => {
       await refreshAdminAnalytics({ force: true, preserveOnFailure: false })
-      await loadHeatmapData()
+      await heatmapPromise
       await loadAdminUsers()
     })()
   } else {