Add JSON schema generation for kubeconform CRD validation

- ci/generate-schemas.sh generates schemas from CRD manifests and K8s swagger
- Sources: ArgoCD v3.3.2, Gateway API v1.5.1, Kubernetes v1.33.7
- Optionally fetches live cluster CRDs via kubectl when available
- Generated schemas committed to schemas/ for CI use
- Run `make schemas` to regenerate after CRD version bumps
- validate-apps.sh and validate-clusters.sh check local schemas first

schemas/crd.projectcalico.org/hostendpoint_v1.json

@@ -0,0 +1,69 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "properties": {
+    "apiVersion": {
+      "type": "string"
+    },
+    "kind": {
+      "type": "string"
+    },
+    "metadata": {
+      "type": "object"
+    },
+    "spec": {
+      "properties": {
+        "expectedIPs": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        },
+        "interfaceName": {
+          "type": "string"
+        },
+        "node": {
+          "type": "string"
+        },
+        "ports": {
+          "items": {
+            "properties": {
+              "name": {
+                "type": "string"
+              },
+              "port": {
+                "type": "integer"
+              },
+              "protocol": {
+                "anyOf": [
+                  {
+                    "type": "integer"
+                  },
+                  {
+                    "type": "string"
+                  }
+                ],
+                "pattern": "^.*",
+                "x-kubernetes-int-or-string": true
+              }
+            },
+            "required": [
+              "name",
+              "port",
+              "protocol"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "profiles": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        }
+      },
+      "type": "object"
+    }
+  },
+  "type": "object"
+}