feat: exchange-level log viewer on ExchangeDetail page

Index exchangeId from Camel MDC (camel.exchangeId) as a top-level
keyword field in OpenSearch log indices. Add exchangeId filter to
the log query API and frontend hook. Show a LogViewer on the
ExchangeDetail page filtered to that exchange's logs, with search
input and level filter pills.

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

ui/src/api/queries/logs.ts

@@ -16,19 +16,20 @@ export interface LogEntryResponse {
 export function useApplicationLogs(
   application?: string,
   agentId?: string,
-  options?: { limit?: number; toOverride?: string },
+  options?: { limit?: number; toOverride?: string; exchangeId?: string },
 ) {
   const refetchInterval = useRefreshInterval(15_000);
   const { timeRange } = useGlobalFilters();
   const to = options?.toOverride ?? timeRange.end.toISOString();
 
   return useQuery({
-    queryKey: ['logs', application, agentId, timeRange.start.toISOString(), to, options?.limit],
+    queryKey: ['logs', application, agentId, timeRange.start.toISOString(), to, options?.limit, options?.exchangeId],
     queryFn: async () => {
       const token = useAuthStore.getState().accessToken;
       const params = new URLSearchParams();
       params.set('application', application!);
       if (agentId) params.set('agentId', agentId);
+      if (options?.exchangeId) params.set('exchangeId', options.exchangeId);
       params.set('from', timeRange.start.toISOString());
       params.set('to', to);
       if (options?.limit) params.set('limit', String(options.limit));