fix: add groupName to ExecutionSummary, locale format stat values, inspect column, fix duplicate keys

- Added groupName field to ExecutionSummary Java record and OpenSearch mapper
- Dashboard stat cards use locale-formatted numbers (en-US)
- Added inspect column (↗) linking directly to exchange detail page
- Fixed duplicate React key warning from two columns sharing executionId key

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

cameleer3-server-app/src/main/java/com/cameleer3/server/app/search/OpenSearchIndex.java

@@ -323,6 +323,7 @@ public class OpenSearchIndex implements SearchIndex {
                 (String) src.get("execution_id"),
                 (String) src.get("route_id"),
                 (String) src.get("agent_id"),
+                (String) src.get("group_name"),
                 (String) src.get("status"),
                 src.get("start_time") != null ? Instant.parse((String) src.get("start_time")) : null,
                 src.get("end_time") != null ? Instant.parse((String) src.get("end_time")) : null,