chore: scaffold next.js and tailwind for landing page

frontend/src/landing/next.config.mjs

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+/** @type {import('next').NextConfig} */
+const nextConfig = {};
+
+export default nextConfig;

frontend/src/landing/package.json

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+{
+  "name": "ao-landing-preview",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev -p 3002",
+    "build": "next build",
+    "start": "next start -p 3002"
+  },
+  "dependencies": {
+    "next": "^15",
+    "react": "^19",
+    "react-dom": "^19"
+  },
+  "devDependencies": {
+    "@tailwindcss/postcss": "^4",
+    "@types/node": "^22",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "tailwindcss": "^4",
+    "typescript": "^5"
+  }
+}

frontend/src/landing/postcss.config.mjs

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+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;

frontend/src/landing/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "incremental": true,
+    "plugins": [{ "name": "next" }]
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
+  "exclude": ["node_modules"]
+}