feat: add landing page

apps/landing/src/app/api/hello/route.ts

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+export async function GET(request: Request) {
+  return new Response('Hello, from API!');
+}

apps/landing/src/app/global.css

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+@import 'tailwindcss';
+@source './pages/**/*.{ts,tsx}';
+@source './components/**/*.{ts,tsx}';
+@source './app/**/*.{ts,tsx}';
+@source './src/**/*.{ts,tsx}';
+@source '*.{js,ts,jsx,tsx,mdx}';
+
+@theme {
+  --border: hsl(var(--border));
+  --input: hsl(var(--input));
+  --ring: hsl(var(--ring));
+  --background: hsl(var(--background));
+  --foreground: hsl(var(--foreground));
+
+  --primary: hsl(var(--primary));
+  --primary-foreground: hsl(var(--primary-foreground));
+
+  --secondary: hsl(var(--secondary));
+  --secondary-foreground: hsl(var(--secondary-foreground));
+
+  --destructive: hsl(var(--destructive));
+  --destructive-foreground: hsl(var(--destructive-foreground));
+
+  --muted: hsl(var(--muted));
+  --muted-foreground: hsl(var(--muted-foreground));
+
+  --accent: hsl(var(--accent));
+  --accent-foreground: hsl(var(--accent-foreground));
+
+  --popover: hsl(var(--popover));
+  --popover-foreground: hsl(var(--popover-foreground));
+
+  --card: hsl(var(--card));
+  --card-foreground: hsl(var(--card-foreground));
+
+  --radius-lg: var(--radius);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-sm: calc(var(--radius) - 4px);
+}
+
+@layer base {
+  html {
+    /* Optional kalau mau style dasar */
+  }
+
+  /* Accordion animation (keyframes dan animation) */
+  @keyframes accordion-down {
+    from {
+      height: 0;
+    }
+    to {
+      height: var(--radix-accordion-content-height);
+    }
+  }
+
+  @keyframes accordion-up {
+    from {
+      height: var(--radix-accordion-content-height);
+    }
+    to {
+      height: 0;
+    }
+  }
+
+  .accordion-down {
+    animation: accordion-down 0.2s ease-out;
+  }
+
+  .accordion-up {
+    animation: accordion-up 0.2s ease-out;
+  }
+}

apps/landing/src/app/layout.tsx

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+import './global.css';
+
+export const metadata = {
+  title: 'Welcome to landing',
+  description: 'Generated by create-nx-workspace',
+};
+
+export default function RootLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <html lang="en">
+      <body>{children}</body>
+    </html>
+  );
+}