feat: initialize landing application with Vite and Mantine configuration

apps/landing/src/app.tsx

@@ -0,0 +1,37 @@
+import { ThemeProvider } from '@repo/ui/provider';
+import { Button } from '@repo/ui/components';
+
+export default function App() {
+  return (
+    <ThemeProvider>
+      <div className="flex min-h-screen flex-col items-center justify-center bg-gradient-to-br from-gray-950 via-gray-900 to-gray-800 text-white">
+        <div className="mx-auto max-w-3xl px-6 text-center">
+          <h1 className="text-5xl font-bold tracking-tight sm:text-6xl">
+            Hello from{' '}
+            <span className="bg-gradient-to-r from-blue-400 to-violet-400 bg-clip-text text-transparent">
+              Landing Page
+            </span>
+          </h1>
+
+          <p className="mt-6 text-lg leading-8 text-gray-300">
+            Enterprise-grade solutions for modern businesses.
+            This page is served from{' '}
+            <code className="rounded bg-gray-700/50 px-2 py-0.5 text-sm font-mono text-blue-300">
+              apps/landing
+            </code>{' '}
+            on port <strong>5174</strong>.
+          </p>
+
+          <div className="mt-10 flex items-center justify-center gap-4">
+            <Button>Get Started</Button>
+            <Button variant="outline">Learn More</Button>
+          </div>
+
+          <p className="mt-12 text-xs text-gray-500">
+            ✅ @repo/ui workspace link verified — Button component rendered successfully.
+          </p>
+        </div>
+      </div>
+    </ThemeProvider>
+  );
+}

apps/landing/src/main.css

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+@import 'tailwindcss';
+@import '@repo/ui/theme.css';
+@source "../../../packages/ui/src";

apps/landing/src/main.tsx

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+import './main.css';
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import App from './app';
+
+createRoot(document.getElementById('app')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);