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/components/CopyButton.tsx

@@ -0,0 +1,49 @@
+import { useState } from 'react';
+import { Copy, Check } from 'lucide-react';
+import { Button } from './ui/button';
+
+interface CopyButtonProps {
+  content: string;
+  label?: string;
+  variant?: 'default' | 'outline' | 'secondary' | 'ghost';
+  disabled?: boolean;
+}
+
+export function CopyButton({
+  content,
+  label = 'Copy',
+  variant = 'outline',
+  disabled = false,
+}: CopyButtonProps) {
+  const [copied, setCopied] = useState(false);
+
+  const handleCopy = async () => {
+    try {
+      await navigator.clipboard.writeText(content);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 2000);
+    } catch (error) {
+      console.error('Failed to copy:', error);
+    }
+  };
+
+  return (
+    <Button
+      onClick={handleCopy}
+      variant={variant}
+      disabled={disabled}
+    >
+      {copied ? (
+        <>
+          <Check className="h-4 w-4" />
+          Copied
+        </>
+      ) : (
+        <>
+          <Copy className="h-4 w-4" />
+          {label}
+        </>
+      )}
+    </Button>
+  );
+}