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/components/LayoutShell.tsx

@@ -51,12 +51,12 @@ function buildSearchData(
   if (agents) {
     for (const agent of agents) {
       results.push({
-        id: agent.id,
+        id: agent.instanceId,
         category: 'agent',
-        title: agent.name,
-        badges: [{ label: (agent.state || 'unknown').toUpperCase(), color: healthToColor((agent.state || '').toLowerCase()) }],
-        meta: `${agent.application} · ${agent.version || ''}${agent.agentTps != null ? ` · ${agent.agentTps.toFixed(1)} msg/s` : ''}`,
-        path: `/runtime/${agent.application}/${agent.id}`,
+        title: agent.displayName,
+        badges: [{ label: (agent.status || 'unknown').toUpperCase(), color: healthToColor((agent.status || '').toLowerCase()) }],
+        meta: `${agent.applicationId} · ${agent.version || ''}${agent.tps != null ? ` · ${agent.tps.toFixed(1)} msg/s` : ''}`,
+        path: `/runtime/${agent.applicationId}/${agent.instanceId}`,
       });
     }
   }