feat: Add remote-servers configuration for BIND 9.20

- Create new remote-servers template
- Integrate into configuration generator

templates/named.conf.remote-servers.j2

@@ -0,0 +1,20 @@
+{% for server in item.remote_servers %}
+remote-servers "{{ server.name }}" {
+{% filter indent(bind9_config_indent, true) %}
+{% for key, value in server.items() %}
+{% if key != 'name' %}
+{# Handle known complex types if any, otherwise default to simple string/block #}
+{% if value is iterable and value is not string and value is not mapping %}
+{{ key }} {
+    {% for subitem in value %}
+    {{ subitem }};
+    {% endfor %}
+};
+{% else %}
+{{ key }} {{ value }};
+{% endif %}
+{% endif %}
+{% endfor %}
+{% endfilter %}
+};
+{% endfor %}