feat: Add schema comments to patches

These comments ensure that we get proper yaml language server support
in the patch files.
Also fixes all the resulting language server errors.

patches/cluster-variables.yaml

@@ -1,16 +1,20 @@
+# yaml-language-server: $schema=https://raw.githubusercontent.com/siderolabs/talos/refs/heads/release-1.11/website/content/v1.11/schemas/config.schema.json
 cluster:
   inlineManifests:
     - name: cluster-variables
       contents: |
+        ---
+        # yaml-language-server: $schema=https://raw.githubusercontent.com/yannh/kubernetes-json-schema/refs/heads/master/v1.34.1-standalone-strict/namespace.json
         apiVersion: v1
         kind: Namespace
         metadata:
           name: flux-system
         ---
+        # yaml-language-server: $schema=https://raw.githubusercontent.com/yannh/kubernetes-json-schema/refs/heads/master/v1.34.1-standalone-strict/configmap.json
         apiVersion: v1
         kind: ConfigMap
         metadata:
           name: cluster-variables
           namespace: flux-system
         data:
-          cluster_env: {%- if node.cluster.production %} production {%- else %} staging {%- endif %}
+          cluster_env: "{%- if node.cluster.production %} production {%- else %} staging {%- endif %}"