Add optional SMTP configuration for Authentik, including email host, port, and credentials. Update README and .env.sample to clarify usage for outbound email settings. Introduce blueprint support for enhanced deployment flexibility, with assertions in Ansible tasks to ensure required variables are set when enabled.

ansible/roles/noble_authentik/templates/blueprints/10-noble-public-groups.yaml.j2

@@ -0,0 +1,13 @@
+# Noble — directory groups for the **public** hostname Brand (see role README).
+# Groups are global to the instance; use policies and OAuth scope mappings to scope claims per app.
+version: 1
+metadata:
+  name: noble-public-groups
+  labels:
+    blueprints.goauthentik.io/instantiate: "true"
+entries:
+{% for group in noble_authentik_blueprint_public_groups | default([]) %}
+  - model: authentik_core.group
+    identifiers:
+      name: "{{ group | trim }}"
+{% endfor %}