feat: initial kube-vip Headlamp plugin

Headlamp plugin providing visibility into kube-vip virtual IP and load
balancer deployments. Features:

- Overview dashboard with deployment status, VIP mode, leader election
- Services page with LoadBalancer VIP assignments and detail panels
- Nodes page showing kube-vip pod status and leader designation
- Configuration page with DaemonSet config, IP pools, leases
- Service detail section injected into native Headlamp Service views

Read-only plugin — no cluster write operations. Uses standard K8s
resources (no CRDs): Services, Nodes, Pods, DaemonSets, Leases,
ConfigMaps with kube-vip.io/* annotations.

74 tests across 7 test files. All tsc/lint/format/test checks pass.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vitest.setup.ts

@@ -0,0 +1,43 @@
+import '@testing-library/jest-dom';
+
+// Node 22+ ships a minimal built-in `localStorage` global (property-bag only,
+// no getItem/setItem/removeItem/clear) that shadows jsdom's Web Storage
+// implementation. Provide a spec-compliant shim so code under test works.
+if (typeof localStorage !== 'undefined' && typeof localStorage.getItem !== 'function') {
+  const store = new Map<string, string>();
+
+  const storage = {
+    getItem(key: string): string | null {
+      return store.get(key) ?? null;
+    },
+    setItem(key: string, value: string): void {
+      store.set(key, String(value));
+    },
+    removeItem(key: string): void {
+      store.delete(key);
+    },
+    clear(): void {
+      store.clear();
+    },
+    get length(): number {
+      return store.size;
+    },
+    key(index: number): string | null {
+      return [...store.keys()][index] ?? null;
+    },
+  };
+
+  Object.defineProperty(globalThis, 'localStorage', {
+    value: storage,
+    writable: true,
+    configurable: true,
+  });
+
+  if (typeof window !== 'undefined') {
+    Object.defineProperty(window, 'localStorage', {
+      value: storage,
+      writable: true,
+      configurable: true,
+    });
+  }
+}