Add JSON schema generation for kubeconform CRD validation

- ci/generate-schemas.sh extracts schemas from live cluster CRDs via kubectl
- Generated schemas committed to schemas/ for CI use
- Run `make schemas` to regenerate after CRD or K8s version changes
- validate-apps.sh and validate-clusters.sh check local schemas first
- Remove all kubeconform skip lists — all resource types now have schemas

schemas/rke.cattle.io/rkecluster_v1.json

@@ -0,0 +1,78 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "properties": {
+    "apiVersion": {
+      "type": "string"
+    },
+    "kind": {
+      "type": "string"
+    },
+    "metadata": {
+      "type": "object"
+    },
+    "spec": {
+      "properties": {
+        "controlPlaneEndpoint": {
+          "properties": {
+            "host": {
+              "maxLength": 512,
+              "type": "string"
+            },
+            "port": {
+              "format": "int32",
+              "type": "integer"
+            }
+          },
+          "required": [
+            "host",
+            "port"
+          ],
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "status": {
+      "properties": {
+        "conditions": {
+          "items": {
+            "properties": {
+              "lastTransitionTime": {
+                "type": "string"
+              },
+              "lastUpdateTime": {
+                "type": "string"
+              },
+              "message": {
+                "type": "string"
+              },
+              "reason": {
+                "type": "string"
+              },
+              "status": {
+                "type": "string"
+              },
+              "type": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "status",
+              "type"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "ready": {
+          "type": "boolean"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "required": [
+    "spec"
+  ],
+  "type": "object"
+}