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/public/favicon.svg

@@ -0,0 +1,7 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" rx="6" fill="#0ea5e9"/>
+  <g transform="translate(4, 4)" stroke="white" fill="none" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+    <path d="M6 16.326A7 7 0 1 1 15.71 8h1.79a4.5 4.5 0 0 1 .5 8.973"/>
+    <path d="M13 11l-3 5h4l-3 5"/>
+  </g>
+</svg>

web/public/manifest.json

@@ -0,0 +1,15 @@
+{
+  "short_name": "Wild Cloud",
+  "name": "Wild Cloud Central",
+  "icons": [
+    {
+      "src": "favicon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#0ea5e9",
+  "background_color": "#ffffff"
+}

web/public/vite.svg

@@ -0,0 +1 @@
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