fix(kafka): add fsGroup to pod securityContext for PVC write permissions

Kraft mode fails with AccessDeniedException on meta.properties
because PVC mounts with root ownership. Adding fsGroup: 1000
ensures the volume group matches the Kafka container user.

apps/base/customer1/siriusdevops-db/trading-kafka.yaml

@@ -22,6 +22,8 @@ spec:
       pod:
         securityContext:
           runAsUser: 1000
+          runAsGroup: 1000
+          fsGroup: 1000
           runAsNonRoot: true
   entityOperator:
     topicOperator: {}