feat: Add Wild Central web app (Central-only UI)

Extract Central pages from the wild-cloud web app into a standalone
React app for Wild Central. Includes:

- Central overview, DNS, DHCP, Firewall, VPN, Ingress, CrowdSec pages
- Simplified sidebar with Central-only navigation
- Branding updated to "Wild Central"
- All Cloud-specific pages, components, hooks, and API services removed
- TypeScript type-check and production build pass

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/router/pages/LanDnsPage.tsx

@@ -0,0 +1,10 @@
+import { ErrorBoundary } from '../../components/ErrorBoundary';
+import { LanDnsComponent } from '../../components/LanDnsComponent';
+
+export function LanDnsPage() {
+  return (
+    <ErrorBoundary>
+      <LanDnsComponent />
+    </ErrorBoundary>
+  );
+}