feat(k8s): support acme-email config for Caddy ingress

Adds support for configuring ACME email for Let's Encrypt certificates
in kind deployments. The email can be specified in the spec under
network.acme-email and will be used to configure the Caddy ingress
controller ConfigMap.

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

stack_orchestrator/deploy/spec.py

@@ -128,6 +128,9 @@ class Spec:
     def get_http_proxy(self):
         return self.obj.get(constants.network_key, {}).get(constants.http_proxy_key, [])
 
+    def get_acme_email(self):
+        return self.obj.get(constants.network_key, {}).get("acme-email", "")
+
     def get_annotations(self):
         return self.obj.get(constants.annotations_key, {})