fix: correct response field mappings and add logout button

- SearchResult uses 'data' not 'items', 'total' not 'totalCount'
- ExecutionStats uses 'p99LatencyMs' not 'p99DurationMs'
- TimeseriesBucket uses 'time' not 'timestamp'
- Add user Dropdown with logout action to LayoutShell

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

ui/src/api/schema.d.ts

@@ -151,7 +151,7 @@ export interface components {
       totalCount: number;
       failedCount: number;
       avgDurationMs: number;
-      p99DurationMs: number;
+      p99LatencyMs: number;
       activeCount: number;
       totalToday: number;
       prevTotalCount: number;
@@ -163,7 +163,7 @@ export interface components {
       buckets: components['schemas']['TimeseriesBucket'][];
     };
     TimeseriesBucket: {
-      timestamp: string;
+      time: string;
       totalCount: number;
       failedCount: number;
       avgDurationMs: number;
@@ -171,8 +171,10 @@ export interface components {
       activeCount: number;
     };
     SearchResultExecutionSummary: {
-      items: components['schemas']['ExecutionSummary'][];
-      totalCount: number;
+      data: components['schemas']['ExecutionSummary'][];
+      total: number;
+      offset: number;
+      limit: number;
     };
     UserInfo: {
       userId: string;
@@ -228,7 +230,7 @@ export interface components {
       exchangeCount: number;
       successRate: number;
       avgDurationMs: number;
-      p99DurationMs: number;
+      p99LatencyMs: number;
       errorRate: number;
       throughputPerSec: number;
       sparkline: number[];