Fix Caddy ingress ACME email and RBAC issues

- Add acme_email_key constant for spec.yml parsing
- Add get_acme_email() method to Spec class
- Modify install_ingress_for_kind() to patch ConfigMap with email
- Pass acme-email from spec to ingress installation
- Add 'delete' verb to leases RBAC for certificate lock cleanup

The acme-email field in spec.yml was previously ignored, causing
Let's Encrypt to fail with "unable to parse email address".
The missing delete permission on leases caused lock cleanup failures.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stack_orchestrator/deploy/spec.py

@@ -179,6 +179,9 @@ class Spec:
     def get_deployment_type(self):
         return self.obj.get(constants.deploy_to_key)
 
+    def get_acme_email(self):
+        return self.obj.get(constants.acme_email_key, "")
+
     def is_kubernetes_deployment(self):
         return self.get_deployment_type() in [
             constants.k8s_kind_deploy_type,