feat: add alert panels for NAS, Ingress, Istio charts

- NAS: 80% warning, 90% critical (same as disk)
- Ingress/Istio: Z-score peak detection for traffic spikes
- All placed next to their corresponding charts with scroll

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/page.tsx

@@ -10,6 +10,7 @@ import NodeTable from '@/components/report/NodeTable';
 import NasTable from '@/components/report/NasTable';
 import NetworkTable from '@/components/report/NetworkTable';
 import AlertPanel from '@/components/report/AlertPanel';
+import NetworkAlertPanel from '@/components/report/NetworkAlertPanel';
 import ErrorBoundary from '@/components/ErrorBoundary';
 
 function getDefaultRange() {
@@ -172,18 +173,33 @@ export default function Home() {
         </div>
 
         {data.metrics.nas && data.metrics.nas.length > 0 && (
+          <div className="grid grid-cols-[1fr_280px] gap-4">
             <ErrorBoundary fallback="NAS 차트 오류">
               <TimeSeriesChart title="NAS 사용률" instances={data.metrics.nas} unit="%" />
             </ErrorBoundary>
+            <ErrorBoundary fallback="NAS 주의 구간 오류">
+              <AlertPanel instances={data.metrics.nas} type="nas" height={300} />
+            </ErrorBoundary>
+          </div>
         )}
 
+        <div className="grid grid-cols-[1fr_280px] gap-4">
           <ErrorBoundary fallback="Ingress Network 차트 오류">
             <NetworkChart title="Ingress Network Traffic" data={data.metrics.ingress} />
           </ErrorBoundary>
+          <ErrorBoundary fallback="Ingress 주의 구간 오류">
+            <NetworkAlertPanel data={data.metrics.ingress} height={300} />
+          </ErrorBoundary>
+        </div>
 
+        <div className="grid grid-cols-[1fr_280px] gap-4">
           <ErrorBoundary fallback="Istio Network 차트 오류">
             <NetworkChart title="Istio Network Traffic" data={data.metrics.istio} />
           </ErrorBoundary>
+          <ErrorBoundary fallback="Istio 주의 구간 오류">
+            <NetworkAlertPanel data={data.metrics.istio} height={300} />
+          </ErrorBoundary>
+        </div>
 
         <ErrorBoundary fallback="NodeTable 오류">
           <div>

src/components/report/AlertPanel.tsx

@@ -5,7 +5,7 @@ import { formatTimestamp, formatPercent } from '@/lib/formatters';
 
 interface AlertPanelProps {
   instances: MetricInstance[];
-  type: 'cpu' | 'memory' | 'disk';
+  type: 'cpu' | 'memory' | 'disk' | 'nas';
   height?: number;
 }
 
@@ -49,7 +49,7 @@ function generateAlerts(instances: MetricInstance[], type: string): Alert[] {
           message: `${formatTimestamp(peak.startTime)} ~ ${formatTimestamp(peak.endTime)} Peak (max: ${formatPercent(peak.maxValue)})`,
         });
       });
-    } else if (type === 'disk') {
+    } else if (type === 'disk' || type === 'nas') {
       if (inst.stats.max > 80) {
         alerts.push({
           level: inst.stats.max > 90 ? 'critical' : 'warning',

src/components/report/NetworkAlertPanel.tsx

@@ -0,0 +1,59 @@
+'use client';
+
+import type { NetworkMetrics } from '@/types/metrics';
+import { formatTimestamp, formatBytesPerSec } from '@/lib/formatters';
+
+interface NetworkAlertPanelProps {
+  data: NetworkMetrics;
+  height?: number;
+}
+
+interface Alert {
+  level: 'warning' | 'critical';
+  instance: string;
+  message: string;
+}
+
+export default function NetworkAlertPanel({ data, height = 300 }: NetworkAlertPanelProps) {
+  const alerts: Alert[] = [];
+
+  [...data.receive, ...data.transmit].forEach((inst) => {
+    const direction = data.receive.includes(inst) ? 'RX' : 'TX';
+    const label = `${direction} ${inst.instance || 'total'}`;
+
+    inst.peaks.peaks.forEach((peak) => {
+      alerts.push({
+        level: 'warning',
+        instance: label,
+        message: `${formatTimestamp(peak.startTime)} ~ ${formatTimestamp(peak.endTime)} 트래픽 급증 (max: ${formatBytesPerSec(peak.maxValue)})`,
+      });
+    });
+  });
+
+  if (alerts.length === 0) {
+    return (
+      <div className="bg-green-50 border border-green-200 rounded-lg p-3 flex items-center justify-center" style={{ height }}>
+        <p className="text-green-700 text-xs">특이사항 없음</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className="bg-white border rounded-lg flex flex-col" style={{ height }}>
+      <div className="px-3 py-2 border-b bg-gray-50 flex-shrink-0">
+        <h4 className="text-xs font-medium text-gray-600">주의 구간 ({alerts.length}건)</h4>
+      </div>
+      <ul className="divide-y divide-gray-100 overflow-y-auto flex-1">
+        {alerts.map((alert, idx) => (
+          <li key={idx} className="px-3 py-2 flex items-start gap-2">
+            <span className="mt-1 inline-block w-1.5 h-1.5 rounded-full flex-shrink-0 bg-yellow-500" />
+            <div className="text-xs">
+              <span className="font-medium text-gray-800">{alert.instance}</span>
+              <p className="text-gray-500">{alert.message}</p>
+            </div>
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}