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/Exchanges/ExchangeHeader.tsx

@@ -54,9 +54,9 @@ export function ExchangeHeader({ detail, onCorrelatedSelect, onClearSelection }:
   const { agentState, hasRouteControl, hasReplay } = useMemo(() => {
     if (!agents) return { agentState: undefined, hasRouteControl: false, hasReplay: false };
     const agentList = agents as any[];
-    const agent = detail.instanceId ? agentList.find((a: any) => a.id === detail.instanceId) : undefined;
+    const agent = detail.instanceId ? agentList.find((a: any) => a.instanceId === detail.instanceId) : undefined;
     return {
-      agentState: agent?.state?.toLowerCase() as 'live' | 'stale' | 'dead' | undefined,
+      agentState: agent?.status?.toLowerCase() as 'live' | 'stale' | 'dead' | undefined,
       hasRouteControl: agentList.some((a: any) => a.capabilities?.routeControl === true),
       hasReplay: agentList.some((a: any) => a.capabilities?.replay === true),
     };