refactor: rename group/groupName to application/applicationName

The execution-related "group" concept actually represents the
application name. Rename all Java fields, API parameters, and frontend
types from groupName→applicationName and group→application for clarity.

- Java records: ExecutionSummary, ExecutionDetail, ExecutionDocument,
  ExecutionRecord, ProcessorRecord
- API params: SearchRequest.group→application, SearchController
  @RequestParam group→application
- Services: IngestionService, DetailService, SearchIndexer, StatsStore
- Frontend: schema.d.ts, Dashboard, ExchangeDetail, RouteDetail,
  executions query hooks

Database column names (group_name) and OpenSearch field names are
unchanged — only the API-facing Java/TS field names are renamed.

RBAC group references (groups table, GroupRepository, GroupsTab) are
a separate domain concept and are NOT affected by this change.

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

ui/src/api/queries/executions.ts

@@ -6,10 +6,10 @@ export function useExecutionStats(
   timeFrom: string | undefined,
   timeTo: string | undefined,
   routeId?: string,
-  group?: string,
+  application?: string,
 ) {
   return useQuery({
-    queryKey: ['executions', 'stats', timeFrom, timeTo, routeId, group],
+    queryKey: ['executions', 'stats', timeFrom, timeTo, routeId, application],
     queryFn: async () => {
       const { data, error } = await api.GET('/search/stats', {
         params: {
@@ -17,7 +17,7 @@ export function useExecutionStats(
             from: timeFrom!,
             to: timeTo || undefined,
             routeId: routeId || undefined,
-            group: group || undefined,
+            application: application || undefined,
           },
         },
       });
@@ -49,10 +49,10 @@ export function useStatsTimeseries(
   timeFrom: string | undefined,
   timeTo: string | undefined,
   routeId?: string,
-  group?: string,
+  application?: string,
 ) {
   return useQuery({
-    queryKey: ['executions', 'timeseries', timeFrom, timeTo, routeId, group],
+    queryKey: ['executions', 'timeseries', timeFrom, timeTo, routeId, application],
     queryFn: async () => {
       const { data, error } = await api.GET('/search/stats/timeseries', {
         params: {
@@ -61,7 +61,7 @@ export function useStatsTimeseries(
             to: timeTo || undefined,
             buckets: 24,
             routeId: routeId || undefined,
-            group: group || undefined,
+            application: application || undefined,
           },
         },
       });

ui/src/api/schema.d.ts

@@ -1079,7 +1079,7 @@ export interface components {
             routeId?: string;
             agentId?: string;
             processorType?: string;
-            group?: string;
+            application?: string;
             agentIds?: string[];
             /** Format: int32 */
             offset?: number;
@@ -1092,7 +1092,7 @@ export interface components {
             executionId: string;
             routeId: string;
             agentId: string;
-            groupName: string;
+            applicationName: string;
             status: string;
             /** Format: date-time */
             startTime: string;
@@ -1327,7 +1327,7 @@ export interface components {
             errorStackTrace: string;
             diagramContentHash: string;
             processors: components["schemas"]["ProcessorNode"][];
-            groupName?: string;
+            applicationName?: string;
             children?: components["schemas"]["ProcessorNode"][];
         };
         ProcessorNode: {
@@ -2977,7 +2977,7 @@ export interface operations {
                 from: string;
                 to?: string;
                 routeId?: string;
-                group?: string;
+                application?: string;
             };
             header?: never;
             path?: never;
@@ -3003,7 +3003,7 @@ export interface operations {
                 to?: string;
                 buckets?: number;
                 routeId?: string;
-                group?: string;
+                application?: string;
             };
             header?: never;
             path?: never;

ui/src/pages/Dashboard/Dashboard.tsx

@@ -36,7 +36,7 @@ export default function Dashboard() {
   const { data: searchResult } = useSearchExecutions({
     timeFrom, timeTo,
     routeId: routeId || undefined,
-    group: appId || undefined,
+    application: appId || undefined,
     offset: 0, limit: 50,
   }, true);
   const { data: detail } = useExecutionDetail(selectedId);
@@ -94,7 +94,7 @@ export default function Dashboard() {
       ),
     },
     { key: 'routeId', header: 'Route', sortable: true, render: (v) => <span>{String(v)}</span> },
-    { key: 'groupName', header: 'Application', sortable: true, render: (v) => <span>{String(v ?? '')}</span> },
+    { key: 'applicationName', header: 'Application', sortable: true, render: (v) => <span>{String(v ?? '')}</span> },
     { key: 'executionId', header: 'Exchange ID', sortable: true, render: (v) => <MonoText size="xs">{String(v)}</MonoText> },
     { key: 'startTime', header: 'Started', sortable: true, render: (v) => <MonoText size="xs">{new Date(v as string).toISOString().replace('T', ' ').slice(0, 19)}</MonoText> },
     {

ui/src/pages/ExchangeDetail/ExchangeDetail.tsx

@@ -94,7 +94,7 @@ export default function ExchangeDetail() {
     <div>
       <Breadcrumb items={[
         { label: 'Dashboard', href: '/apps' },
-        { label: detail.groupName || 'App', href: `/apps/${detail.groupName}` },
+        { label: detail.applicationName || 'App', href: `/apps/${detail.applicationName}` },
         { label: id?.slice(0, 12) || '' },
       ]} />
 
@@ -109,11 +109,11 @@ export default function ExchangeDetail() {
                 <Badge label={detail.status} color={detail.status === 'COMPLETED' ? 'success' : 'error'} variant="filled" />
               </div>
               <div className={styles.exchangeRoute}>
-                Route: <span className={styles.routeLink} onClick={() => navigate(`/apps/${detail.groupName}/${detail.routeId}`)}>{detail.routeId}</span>
-                {detail.groupName && (
+                Route: <span className={styles.routeLink} onClick={() => navigate(`/apps/${detail.applicationName}/${detail.routeId}`)}>{detail.routeId}</span>
+                {detail.applicationName && (
                   <>
                     <span className={styles.headerDivider}>&middot;</span>
-                    App: <MonoText size="xs">{detail.groupName}</MonoText>
+                    App: <MonoText size="xs">{detail.applicationName}</MonoText>
                   </>
                 )}
               </div>

ui/src/pages/Routes/RouteDetail.tsx

@@ -51,7 +51,7 @@ export default function RouteDetail() {
     timeFrom,
     timeTo,
     routeId: routeId || undefined,
-    group: appId || undefined,
+    application: appId || undefined,
     offset: 0,
     limit: 50,
   });
@@ -59,7 +59,7 @@ export default function RouteDetail() {
     timeFrom,
     timeTo,
     routeId: routeId || undefined,
-    group: appId || undefined,
+    application: appId || undefined,
     status: 'FAILED',
     offset: 0,
     limit: 200,