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/api/schema.d.ts

@@ -1916,9 +1916,9 @@ export interface components {
         };
         /** @description Agent instance summary with runtime metrics */
         AgentInstanceResponse: {
-            id: string;
-            name: string;
-            application: string;
+            instanceId: string;
+            displayName: string;
+            applicationId: string;
             status: string;
             routeIds: string[];
             /** Format: date-time */