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>

cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/DetailService.java

@@ -20,7 +20,7 @@ public class DetailService {
                     List<ProcessorNode> roots = buildTree(processors);
                     return new ExecutionDetail(
                             exec.executionId(), exec.routeId(), exec.agentId(),
-                            exec.groupName(),
+                            exec.applicationName(),
                             exec.status(), exec.startTime(), exec.endTime(),
                             exec.durationMs() != null ? exec.durationMs() : 0L,
                             exec.correlationId(), exec.exchangeId(),

cameleer3-server-core/src/main/java/com/cameleer3/server/core/detail/ExecutionDetail.java

@@ -27,7 +27,7 @@ public record ExecutionDetail(
         String executionId,
         String routeId,
         String agentId,
-        String groupName,
+        String applicationName,
         String status,
         Instant startTime,
         Instant endTime,

cameleer3-server-core/src/main/java/com/cameleer3/server/core/indexing/SearchIndexer.java

@@ -74,7 +74,7 @@ public class SearchIndexer implements SearchIndexerStats {
                     .toList();
 
             searchIndex.index(new ExecutionDocument(
-                    exec.executionId(), exec.routeId(), exec.agentId(), exec.groupName(),
+                    exec.executionId(), exec.routeId(), exec.agentId(), exec.applicationName(),
                     exec.status(), exec.correlationId(), exec.exchangeId(),
                     exec.startTime(), exec.endTime(), exec.durationMs(),
                     exec.errorMessage(), exec.errorStacktrace(), processorDocs));

cameleer3-server-core/src/main/java/com/cameleer3/server/core/ingestion/IngestionService.java

@@ -38,18 +38,18 @@ public class IngestionService {
         this.bodySizeLimit = bodySizeLimit;
     }
 
-    public void ingestExecution(String agentId, String groupName, RouteExecution execution) {
-        ExecutionRecord record = toExecutionRecord(agentId, groupName, execution);
+    public void ingestExecution(String agentId, String applicationName, RouteExecution execution) {
+        ExecutionRecord record = toExecutionRecord(agentId, applicationName, execution);
         executionStore.upsert(record);
 
         if (execution.getProcessors() != null && !execution.getProcessors().isEmpty()) {
             List<ProcessorRecord> processors = flattenProcessors(
                     execution.getProcessors(), record.executionId(),
-                    record.startTime(), groupName, execution.getRouteId(),
+                    record.startTime(), applicationName, execution.getRouteId(),
                     null, 0);
             executionStore.upsertProcessors(
                     record.executionId(), record.startTime(),
-                    groupName, execution.getRouteId(), processors);
+                    applicationName, execution.getRouteId(), processors);
         }
 
         eventPublisher.accept(new ExecutionUpdatedEvent(
@@ -72,13 +72,13 @@ public class IngestionService {
         return metricsBuffer;
     }
 
-    private ExecutionRecord toExecutionRecord(String agentId, String groupName,
+    private ExecutionRecord toExecutionRecord(String agentId, String applicationName,
                                                RouteExecution exec) {
         String diagramHash = diagramStore
                 .findContentHashForRoute(exec.getRouteId(), agentId)
                 .orElse("");
         return new ExecutionRecord(
-                exec.getExchangeId(), exec.getRouteId(), agentId, groupName,
+                exec.getExchangeId(), exec.getRouteId(), agentId, applicationName,
                 exec.getStatus() != null ? exec.getStatus().name() : "RUNNING",
                 exec.getCorrelationId(), exec.getExchangeId(),
                 exec.getStartTime(), exec.getEndTime(),
@@ -90,13 +90,13 @@ public class IngestionService {
 
     private List<ProcessorRecord> flattenProcessors(
             List<ProcessorExecution> processors, String executionId,
-            java.time.Instant execStartTime, String groupName, String routeId,
+            java.time.Instant execStartTime, String applicationName, String routeId,
             String parentProcessorId, int depth) {
         List<ProcessorRecord> flat = new ArrayList<>();
         for (ProcessorExecution p : processors) {
             flat.add(new ProcessorRecord(
                     executionId, p.getProcessorId(), p.getProcessorType(),
-                    p.getDiagramNodeId(), groupName, routeId,
+                    p.getDiagramNodeId(), applicationName, routeId,
                     depth, parentProcessorId,
                     p.getStatus() != null ? p.getStatus().name() : "RUNNING",
                     p.getStartTime() != null ? p.getStartTime() : execStartTime,
@@ -109,7 +109,7 @@ public class IngestionService {
             if (p.getChildren() != null) {
                 flat.addAll(flattenProcessors(
                         p.getChildren(), executionId, execStartTime,
-                        groupName, routeId, p.getProcessorId(), depth + 1));
+                        applicationName, routeId, p.getProcessorId(), depth + 1));
             }
         }
         return flat;

cameleer3-server-core/src/main/java/com/cameleer3/server/core/search/ExecutionSummary.java

@@ -23,7 +23,7 @@ public record ExecutionSummary(
         String executionId,
         String routeId,
         String agentId,
-        String groupName,
+        String applicationName,
         String status,
         Instant startTime,
         Instant endTime,

cameleer3-server-core/src/main/java/com/cameleer3/server/core/search/SearchRequest.java

@@ -22,7 +22,7 @@ import java.util.List;
  * @param routeId       exact match on route_id
  * @param agentId       exact match on agent_id
  * @param processorType matches processor_types array via has()
- * @param group         application group filter (resolved to agentIds server-side)
+ * @param application   application name filter (resolved to agentIds server-side)
  * @param agentIds      list of agent IDs (resolved from group, used for IN clause)
  * @param offset        pagination offset (0-based)
  * @param limit         page size (default 50, max 500)
@@ -43,7 +43,7 @@ public record SearchRequest(
         String routeId,
         String agentId,
         String processorType,
-        String group,
+        String application,
         List<String> agentIds,
         int offset,
         int limit,
@@ -80,12 +80,12 @@ public record SearchRequest(
         return SORT_FIELD_TO_COLUMN.getOrDefault(sortField, "start_time");
     }
 
-    /** Create a copy with resolved agentIds (from group lookup). */
+    /** Create a copy with resolved agentIds (from application name lookup). */
     public SearchRequest withAgentIds(List<String> resolvedAgentIds) {
         return new SearchRequest(
                 status, timeFrom, timeTo, durationMin, durationMax, correlationId,
                 text, textInBody, textInHeaders, textInErrors,
-                routeId, agentId, processorType, group, resolvedAgentIds,
+                routeId, agentId, processorType, application, resolvedAgentIds,
                 offset, limit, sortField, sortDir
         );
     }

cameleer3-server-core/src/main/java/com/cameleer3/server/core/storage/ExecutionStore.java

@@ -9,7 +9,7 @@ public interface ExecutionStore {
     void upsert(ExecutionRecord execution);
 
     void upsertProcessors(String executionId, Instant startTime,
-                          String groupName, String routeId,
+                          String applicationName, String routeId,
                           List<ProcessorRecord> processors);
 
     Optional<ExecutionRecord> findById(String executionId);
@@ -17,7 +17,7 @@ public interface ExecutionStore {
     List<ProcessorRecord> findProcessors(String executionId);
 
     record ExecutionRecord(
-            String executionId, String routeId, String agentId, String groupName,
+            String executionId, String routeId, String agentId, String applicationName,
             String status, String correlationId, String exchangeId,
             Instant startTime, Instant endTime, Long durationMs,
             String errorMessage, String errorStacktrace, String diagramContentHash
@@ -25,7 +25,7 @@ public interface ExecutionStore {
 
     record ProcessorRecord(
             String executionId, String processorId, String processorType,
-            String diagramNodeId, String groupName, String routeId,
+            String diagramNodeId, String applicationName, String routeId,
             int depth, String parentProcessorId, String status,
             Instant startTime, Instant endTime, Long durationMs,
             String errorMessage, String errorStacktrace,

cameleer3-server-core/src/main/java/com/cameleer3/server/core/storage/StatsStore.java

@@ -12,7 +12,7 @@ public interface StatsStore {
     ExecutionStats stats(Instant from, Instant to);
 
     // Per-app stats (stats_1m_app)
-    ExecutionStats statsForApp(Instant from, Instant to, String groupName);
+    ExecutionStats statsForApp(Instant from, Instant to, String applicationName);
 
     // Per-route stats (stats_1m_route), optionally scoped to specific agents
     ExecutionStats statsForRoute(Instant from, Instant to, String routeId, List<String> agentIds);
@@ -24,7 +24,7 @@ public interface StatsStore {
     StatsTimeseries timeseries(Instant from, Instant to, int bucketCount);
 
     // Per-app timeseries
-    StatsTimeseries timeseriesForApp(Instant from, Instant to, int bucketCount, String groupName);
+    StatsTimeseries timeseriesForApp(Instant from, Instant to, int bucketCount, String applicationName);
 
     // Per-route timeseries, optionally scoped to specific agents
     StatsTimeseries timeseriesForRoute(Instant from, Instant to, int bucketCount,

cameleer3-server-core/src/main/java/com/cameleer3/server/core/storage/model/ExecutionDocument.java

@@ -4,7 +4,7 @@ import java.time.Instant;
 import java.util.List;
 
 public record ExecutionDocument(
-        String executionId, String routeId, String agentId, String groupName,
+        String executionId, String routeId, String agentId, String applicationName,
         String status, String correlationId, String exchangeId,
         Instant startTime, Instant endTime, Long durationMs,
         String errorMessage, String errorStacktrace,