FIX(app): fix todo-dev ExternalSecret field name and reorganize

- Fix deletePolicy to deletionPolicy in externalsecret.yaml
- Move serviceaccount.yaml to base (remove duplicate)
- Add secretstore.yaml to prod
- Add deletionPolicy to prod externalsecret

deploy/k8s/base/kustomization.yaml

@@ -4,6 +4,7 @@ kind: Kustomization
 resources:
   - deployment.yaml
   - service.yaml
+  - serviceaccount.yaml
 
 commonLabels:
   app.kubernetes.io/name: todo