feat(logs): 结果表虚拟滚动（@tanstack/react-virtual），>300 条时只渲染可视区

=== 一、为什么 ===
结果表原来是 entries.map 全量渲染真实 DOM。实测每条日志约 671B：
  1000 条页面 → 1000 个 DOM 节点，且大量消息带 whitespace-pre-wrap
  自动换行（Java 堆栈尤其长），浏览器需要排版全部行 → 滚动卡顿。
这是当前"每页条数"的真正瓶颈，比传 655KB 响应更影响体验。

=== 二、实现要点 ===
1. 新增 components/VirtualLogList.tsx
   - useVirtualizer（**独立滚动容器**，非 window 滚动）
     原因：window 虚拟滚动要把列表相对文档顶部偏移 scrollMargin 算准，
     上方工具条高度一变（快捷模板/域过滤条出现隐藏）就错位；
     独立容器内虚拟项位置只跟容器滚动量有关，不依赖页面布局。
   - 行高不一（消息会换行）→ 用 measureElement 实测每行高度
   - 容器 max-h-70vh，overscan 10
2. 抽公共行组件 LogRow，普通渲染与虚拟滚动**共用同一份 DOM 结构**，
   levelBadgeClass 逐字沿用原实现（含 info/warn/debug 配色），保证外观不变
3. 安全阀：VIRTUAL_THRESHOLD = 300
   - 默认每页 200 条仍走原来的普通渲染（行为已验证，零风险）
   - 用户主动把每页调到 500/1000 才启用虚拟滚动
4. 依赖：@tanstack/react-virtual ^3.14.23（package.json + lock 已更新，
   Docker 内 npm ci 可复现）

=== 三、验证 ===
- 本地 npx tsc -b --force 全量类型检查通过（rc=0）
- 产物 bundle 含 getVirtualItems / measureElement / getTotalSize
- 页面与主 JS 资源均 HTTP 200
- 平台健康 ok；hub latest 与 Pod digest 一致

镜像：lghost/lokistack:latest + v0.1 = sha256:25002cebc77c

frontend/package-lock.json

@@ -35,6 +35,7 @@
         "@radix-ui/react-toggle": "^1.1.10",
         "@radix-ui/react-toggle-group": "^1.1.11",
         "@radix-ui/react-tooltip": "^1.2.8",
+        "@tanstack/react-virtual": "^3.14.23",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
         "cmdk": "^1.1.1",
@@ -2916,6 +2917,33 @@
       "version": "0.3.0",
       "license": "MIT"
     },
+    "node_modules/@tanstack/react-virtual": {
+      "version": "3.14.23",
+      "resolved": "https://registry.npmmirror.com/@tanstack/react-virtual/-/react-virtual-3.14.23.tgz",
+      "integrity": "sha512-Oyy58qQwdaQieA+A4WUDtnh9D1rv5FZvGdw8og9Xeyh88V6HH94vMSyV5i9ATIbYNe9t5Ix0WXRo9NOTpHDkYw==",
+      "license": "MIT",
+      "dependencies": {
+        "@tanstack/virtual-core": "3.19.8"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      },
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
+        "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
+    "node_modules/@tanstack/virtual-core": {
+      "version": "3.19.8",
+      "resolved": "https://registry.npmmirror.com/@tanstack/virtual-core/-/virtual-core-3.19.8.tgz",
+      "integrity": "sha512-Oz/SYBo/aVPyQkwtOw7Q23myITUgFIof2glQqydYJAPL6mH2SkJDkvDKZTklB+7gv5jGLZQhyTcd7SO1A1EODQ==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/tannerlinsley"
+      }
+    },
     "node_modules/@types/babel__core": {
       "version": "7.20.5",
       "dev": true,

frontend/package.json

@@ -37,6 +37,7 @@
     "@radix-ui/react-toggle": "^1.1.10",
     "@radix-ui/react-toggle-group": "^1.1.11",
     "@radix-ui/react-tooltip": "^1.2.8",
+    "@tanstack/react-virtual": "^3.14.23",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",

frontend/src/pages/logs/components/LogResultsPanel.tsx

@@ -5,20 +5,15 @@ import { Button } from '@/components/ui/button'
 import { SearchableValueSelect } from '@/components/SearchableValueSelect'
 import type { LogEntry } from '@/api/logs'
 import { parseIngressAccessLog } from '@/lib/ingress-access-log'
-import { applyLabelFilter } from '../query-utils'
-import { HighlightedLogLine } from './HighlightedLogLine'
 import { QueryEmptyState } from './QueryEmptyState'
+import { LogRow, VirtualLogList } from './VirtualLogList'
 
-function levelBadgeClass(level: string) {
-  const value = (level || '').toLowerCase()
-  if (value.includes('error') || value === 'err' || value === 'fatal' || value === 'critical') {
-    return 'rounded bg-destructive/15 px-1 text-destructive'
-  }
-  if (value.includes('warn')) return 'rounded bg-warning/15 px-1 text-warning'
-  if (value.includes('info')) return 'rounded bg-info/15 px-1 text-info'
-  if (value.includes('debug') || value.includes('trace')) return 'rounded bg-muted px-1 text-muted-foreground'
-  return 'rounded bg-muted px-1 text-muted-foreground'
-}
+/**
+ * 超过这个条数才启用虚拟滚动。
+ * 默认每页 200 条走普通渲染（已验证的外观/行为不变），
+ * 只有用户主动把每页调到 500/1000 时才走虚拟滚动 —— 降低改动风险。
+ */
+const VIRTUAL_THRESHOLD = 300
 
 // 只保留原始日志视图;表格/折线/流图/饼图等可视化已迁至「日志分析」页(LogDetailSection)
 
@@ -67,15 +62,25 @@ export function LogResultsPanel({ entries, searched, hasSource, pageIndex, hasNe
       <Button type="button" size="sm" variant="outline" disabled={!domainFilter.trim() || loading} onClick={() => onApplyDomain(domainFilter.trim())}>{t('results.domainQuery')}</Button>
       <span className="text-muted-foreground">{t('results.domainHint', { shown: visibleEntries.length, total: entries.length })}</span>
     </div>}
-    {entries.length === 0 ? <QueryEmptyState searched={searched} hasSource={hasSource} onRetry={onSearch} /> : visibleEntries.length === 0 ? <p className="py-10 text-center text-sm text-muted-foreground">{t('results.domainNoMatch')}</p> : <div className="divide-y">
+    {entries.length === 0 ? <QueryEmptyState searched={searched} hasSource={hasSource} onRetry={onSearch} /> : visibleEntries.length === 0 ? <p className="py-10 text-center text-sm text-muted-foreground">{t('results.domainNoMatch')}</p> : visibleEntries.length > VIRTUAL_THRESHOLD ? (
+      <VirtualLogList
+        entries={visibleEntries}
+        query={query}
+        terms={terms}
+        onQueryChange={onQueryChange}
+        onShowContext={onShowContext}
+      />
+    ) : <div className="divide-y">
       {visibleEntries.map((row, index) => <div key={`${row.timestampNs}-${index}`} className="py-2 text-sm">
-        <div className="flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
-          <time className="font-mono tabular-nums">{new Date(row.timestamp).toLocaleString()}</time>
-          <span className={levelBadgeClass(row.level)}>{row.level}</span>
-          {Object.entries(row.labels).filter(([key]) => ['namespace', 'app', 'pod'].includes(key)).map(([key, value]) => <button key={key} title={t('results.filterLabel')} className="hover:text-primary" onClick={() => onQueryChange(applyLabelFilter(query, key, value))}>{key}={value}</button>)}
-          <button className="text-primary hover:underline" onClick={() => onShowContext(row)}>{t('results.showContext')}</button>
-        </div>
-        <HighlightedLogLine message={row.message} terms={terms} className="mt-1 whitespace-pre-wrap break-all font-mono" />
+        <LogRow
+          row={row}
+          query={query}
+          terms={terms}
+          onQueryChange={onQueryChange}
+          onShowContext={onShowContext}
+          filterLabel={t('results.filterLabel')}
+          showContext={t('results.showContext')}
+        />
       </div>)}
     </div>}
     {searched && entries.length > 0 && <div className="mt-3 flex items-center gap-2">

frontend/src/pages/logs/components/VirtualLogList.tsx

@@ -0,0 +1,110 @@
+import { useRef } from 'react'
+import { useVirtualizer } from '@tanstack/react-virtual'
+import { useTranslation } from 'react-i18next'
+import type { LogEntry } from '@/api/logs'
+import { applyLabelFilter } from '../query-utils'
+import { HighlightedLogLine } from './HighlightedLogLine'
+
+/** 单行日志（普通渲染与虚拟滚动共用，保证两种模式外观完全一致） */
+function LogRow({ row, query, terms, onQueryChange, onShowContext, filterLabel, showContext }: {
+  row: LogEntry
+  query: string
+  terms: string[]
+  onQueryChange: (query: string) => void
+  onShowContext: (row: LogEntry) => void
+  filterLabel: string
+  showContext: string
+}) {
+  return <>
+    <div className="flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
+      <time className="font-mono tabular-nums">{new Date(row.timestamp).toLocaleString()}</time>
+      <span className={levelBadgeClass(row.level ?? '')}>{row.level}</span>
+      {Object.entries(row.labels).filter(([key]) => ['namespace', 'app', 'pod'].includes(key)).map(([key, value]) => (
+        <button key={key} title={filterLabel} className="hover:text-primary" onClick={() => onQueryChange(applyLabelFilter(query, key, value))}>{key}={value}</button>
+      ))}
+      <button className="text-primary hover:underline" onClick={() => onShowContext(row)}>{showContext}</button>
+    </div>
+    <HighlightedLogLine message={row.message} terms={terms} className="mt-1 whitespace-pre-wrap break-all font-mono" />
+  </>
+}
+
+/** 与 LogResultsPanel 原有实现逐字一致，避免虚拟/普通两种模式外观不同 */
+function levelBadgeClass(level: string) {
+  const value = (level || '').toLowerCase()
+  if (value.includes('error') || value === 'err' || value === 'fatal' || value === 'critical') {
+    return 'rounded bg-destructive/15 px-1 text-destructive'
+  }
+  if (value.includes('warn')) return 'rounded bg-warning/15 px-1 text-warning'
+  if (value.includes('info')) return 'rounded bg-info/15 px-1 text-info'
+  if (value.includes('debug') || value.includes('trace')) return 'rounded bg-muted px-1 text-muted-foreground'
+  return 'rounded bg-muted px-1 text-muted-foreground'
+}
+
+/**
+ * 虚拟滚动结果列表。
+ *
+ * 为什么需要：结果表原来把每一行都渲染成真实 DOM。实测每条日志约 671B，
+ * 1000 条页面就有 1000 个节点，其中大量是带自动换行的长消息（Java 堆栈），
+ * 浏览器要排版全部行，滚动明显卡顿。
+ *
+ * 为什么用「独立滚动容器」而不是 window 滚动：
+ * window 虚拟滚动需要把列表相对文档顶部的偏移量（scrollMargin）算准，
+ * 一旦上方工具条高度变化（快捷模板、域过滤条出现/隐藏）就会错位。
+ * 这里让列表自己滚动，虚拟项位置只与容器滚动量有关，不依赖页面布局。
+ *
+ * 变高行处理：日志消息会换行，行高不等，所以用 measureElement 实测每行高度。
+ */
+export function VirtualLogList({ entries, query, terms, onQueryChange, onShowContext }: {
+  entries: LogEntry[]
+  query: string
+  terms: string[]
+  onQueryChange: (query: string) => void
+  onShowContext: (row: LogEntry) => void
+}) {
+  const { t } = useTranslation('logs')
+  const parentRef = useRef<HTMLDivElement>(null)
+
+  const virtualizer = useVirtualizer({
+    count: entries.length,
+    getScrollElement: () => parentRef.current,
+    estimateSize: () => 72,
+    overscan: 10,
+    getItemKey: index => `${entries[index]?.timestampNs ?? index}-${index}`,
+  })
+
+  const items = virtualizer.getVirtualItems()
+
+  return (
+    <div
+      ref={parentRef}
+      className="max-h-[70vh] overflow-auto rounded-lg border"
+      role="list"
+      aria-label={t('results.aria')}
+    >
+      <div style={{ height: virtualizer.getTotalSize(), position: 'relative', width: '100%' }}>
+        {items.map(item => (
+          <div
+            key={item.key}
+            data-index={item.index}
+            ref={virtualizer.measureElement}
+            role="listitem"
+            className="absolute left-0 top-0 w-full border-b px-3 py-2 text-sm"
+            style={{ transform: `translateY(${item.start}px)` }}
+          >
+            <LogRow
+              row={entries[item.index]}
+              query={query}
+              terms={terms}
+              onQueryChange={onQueryChange}
+              onShowContext={onShowContext}
+              filterLabel={t('results.filterLabel')}
+              showContext={t('results.showContext')}
+            />
+          </div>
+        ))}
+      </div>
+    </div>
+  )
+}
+
+export { LogRow, levelBadgeClass }