fix: update agent field names in frontend to match backend DTO

The AgentInstanceResponse backend DTO uses instanceId, displayName,
applicationId, status — but the stale schema.d.ts still had id, name,
application, state. This caused the runtime table to show no data.

- Update schema.d.ts AgentInstanceResponse fields
- Fix AgentHealth: row.id→instanceId, row.name→displayName,
  row.application→applicationId, inst.id→instanceId
- Fix AgentInstance: agent.id→instanceId, agent.name→displayName
- Fix ExchangeHeader: agent.id→instanceId, agent.state→status
- Fix LayoutShell search: agent.state→status, agentTps→tps

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/pages/AgentInstance/AgentInstance.tsx

@@ -48,13 +48,13 @@ export default function AgentInstance() {
   const { data: timeseries } = useStatsTimeseries(timeFrom, timeTo, undefined, appId);
 
   const agent = useMemo(
-    () => (agents || []).find((a: any) => a.id === instanceId) as any,
+    () => (agents || []).find((a: any) => a.instanceId === instanceId) as any,
     [agents, instanceId],
   );
 
   // Stat card metrics (latest 1 bucket)
   const { data: latestMetrics } = useAgentMetrics(
-    agent?.id || null,
+    agent?.instanceId || null,
     ['jvm.cpu.process', 'jvm.memory.heap.used', 'jvm.memory.heap.max'],
     1,
   );
@@ -65,7 +65,7 @@ export default function AgentInstance() {
 
   // Chart metrics (60 buckets)
   const { data: jvmMetrics } = useAgentMetrics(
-    agent?.id || null,
+    agent?.instanceId || null,
     ['jvm.cpu.process', 'jvm.memory.heap.used', 'jvm.memory.heap.max', 'jvm.threads.count', 'jvm.gc.time'],
     60,
   );
@@ -236,7 +236,7 @@ export default function AgentInstance() {
               {appId}
             </Link>
             <span className={styles.scopeSep}><ChevronRight size={12} /></span>
-            <span className={styles.scopeCurrent}>{agent.name}</span>
+            <span className={styles.scopeCurrent}>{agent.displayName}</span>
             <StatusDot variant={statusVariant} />
             <Badge label={agent.status} color={statusColor} />
             {agent.version && <Badge label={agent.version} variant="outlined" color="auto" />}