refactor: rename group_name→application_name in DB, OpenSearch, SQL

Consolidate V1-V7 Flyway migrations into single V1__init.sql with
all columns renamed from group_name to application_name. Requires
fresh database (wipe flyway_schema_history, all data).

- DB columns: executions.group_name → application_name,
  processor_executions.group_name → application_name
- Continuous aggregates: all views updated to use application_name
- OpenSearch field: group_name → application_name in index/query
- All Java SQL strings updated to match new column names
- Delete V2-V7 migration files (folded into V1)

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

@@ -288,7 +288,7 @@ public class OpenSearchIndex implements SearchIndex {
         map.put("execution_id", doc.executionId());
         map.put("route_id", doc.routeId());
         map.put("agent_id", doc.agentId());
-        map.put("group_name", doc.applicationName());
+        map.put("application_name", doc.applicationName());
         map.put("status", doc.status());
         map.put("correlation_id", doc.correlationId());
         map.put("exchange_id", doc.exchangeId());
@@ -323,7 +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("application_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,