fix(web): expose secondary query failures

vehicle-data-platform/apps/web/src/v2/pages/OperationsPage.tsx

@@ -15,6 +15,7 @@ export default function OperationsPage() {
   return <div className="v2-ops-page">
     <header className="v2-ops-heading"><div><h2>运维质量</h2><p>服务身份、主车辆档案和实时位置采用不同可核对口径，不用前端估算。</p></div><button onClick={refresh} disabled={health.isFetching || readiness.isFetching}><IconRefresh />刷新证据</button></header>
     {health.isError ? <InlineError message={health.error.message} onRetry={refresh} /> : null}
+    {readiness.isError ? <InlineError message={readiness.error instanceof Error ? readiness.error.message : '协议来源就绪度读取失败'} onRetry={() => readiness.refetch()} /> : null}
     <section className="v2-ops-kpis">
       <article><small>运行版本</small><strong>{data?.runtime.platformRelease || '未注入'}</strong><span className={data?.runtime.dataMode === 'production' ? 'is-ok' : 'is-error'}>{data?.runtime.dataMode || 'unknown'}</span></article>
       <article><small>活跃连接</small><strong>{data?.activeConnections?.toLocaleString('zh-CN') ?? '—'}</strong><span>capacity-check</span></article>