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

@@ -23,6 +23,7 @@ public record ExecutionSummary(
         String executionId,
         String routeId,
         String agentId,
+        String groupName,
         String status,
         Instant startTime,
         Instant endTime,