refactor: unify "Executions" → "Exchanges" terminology

Rename all references from "Execution/executions/execCount" to
"Exchange/exchanges/exchangeCount" to align with Apache Camel's
native Exchange concept. Java class names (CamelExecutionException,
HttpOperationFailedException) are preserved as-is.

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

src/mocks/metrics.ts

@@ -44,7 +44,7 @@ function generateTimeSeries(
 // KPI stat cards data
 export const kpiMetrics: KpiMetric[] = [
   {
-    label: 'Executions (shift)',
+    label: 'Exchanges (shift)',
     value: '3,241',
     trend: 'up',
     trendValue: '+12%',
@@ -147,7 +147,7 @@ export const errorCountSeries: MetricSeries[] = [
 export interface RouteMetricRow {
   routeId: string
   routeName: string
-  execCount: number
+  exchangeCount: number
   successRate: number
   avgDurationMs: number
   p99DurationMs: number
@@ -159,7 +159,7 @@ export const routeMetrics: RouteMetricRow[] = [
   {
     routeId: 'order-intake',
     routeName: 'order-intake',
-    execCount: 892,
+    exchangeCount: 892,
     successRate: 99.2,
     avgDurationMs: 88,
     p99DurationMs: 142,
@@ -169,7 +169,7 @@ export const routeMetrics: RouteMetricRow[] = [
   {
     routeId: 'order-enrichment',
     routeName: 'order-enrichment',
-    execCount: 541,
+    exchangeCount: 541,
     successRate: 97.6,
     avgDurationMs: 156,
     p99DurationMs: 287,
@@ -179,7 +179,7 @@ export const routeMetrics: RouteMetricRow[] = [
   {
     routeId: 'payment-process',
     routeName: 'payment-process',
-    execCount: 414,
+    exchangeCount: 414,
     successRate: 96.1,
     avgDurationMs: 234,
     p99DurationMs: 412,
@@ -189,7 +189,7 @@ export const routeMetrics: RouteMetricRow[] = [
   {
     routeId: 'shipment-dispatch',
     routeName: 'shipment-dispatch',
-    execCount: 387,
+    exchangeCount: 387,
     successRate: 98.4,
     avgDurationMs: 118,
     p99DurationMs: 248,