feat(frontend): analysis/logs 筛选下拉改可搜索 Select

数据源换 ui/select；命名空间复用 SearchableValueSelect 工具条态（可搜、全部置顶、loading）；与 ahead 功能 tip 分开。

frontend/src/pages/logs/index.tsx

@@ -3,6 +3,7 @@ import { toast } from 'sonner'
 import { useTranslation } from 'react-i18next'
 import '@/i18n/domains'
 import { Button } from '@/components/ui/button'
+import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
 import { Input } from '@/components/ui/input'
 import { PageContainer } from '@/components/PageContainer'
 import { TimeRangePicker } from '@/components/TimeRangePicker'
@@ -178,7 +179,14 @@ export default function LogsPage() {
           </div>
         )}
         <div className="flex flex-wrap items-center gap-2">
-          <select aria-label={t('toolbar.sourceAria')} className="h-9 min-w-40 rounded-md border bg-background px-3 text-sm text-foreground" value={sourceId} onChange={event => setSourceId(Number(event.target.value))}>{sources.length === 0 && <option value={0}>{t('toolbar.sourceEmptyOption')}</option>}{sources.map(source => <option key={source.id} value={source.id}>{source.name}</option>)}</select>
+          <Select value={sourceId ? String(sourceId) : undefined} onValueChange={value => setSourceId(Number(value))} disabled={sources.length === 0}>
+            <SelectTrigger className="h-9 min-w-40" aria-label={t('toolbar.sourceAria')}>
+              <SelectValue placeholder={t('toolbar.sourceEmptyOption')} />
+            </SelectTrigger>
+            <SelectContent>
+              {sources.map(source => <SelectItem key={source.id} value={String(source.id)}>{source.name}</SelectItem>)}
+            </SelectContent>
+          </Select>
           <TimeRangePicker start={start} end={end} onChange={(nextStart, nextEnd) => { setStart(nextStart); setEnd(nextEnd); setTail(false) }} />
           <label className="flex items-center gap-1 text-xs text-muted-foreground">{t('toolbar.limitLabel')}<Input type="number" min={1} max={1000} value={limit} onChange={event => setLimit(Math.min(1000, Math.max(1, Number(event.target.value))))} className="h-9 w-24" /></label>
         </div>