feat: setup React + Vite + TypeScript frontend with Tailwind CSS

Initialize frontend infrastructure for Sprint 3 Landing Page:

Infrastructure Setup:
- Create React + Vite + TypeScript project in frontend/ directory
- Install Tailwind CSS, PostCSS, Autoprefixer dependencies
- Generate tailwind.config.js with content paths
- Generate postcss.config.js with plugins configuration
- Add Tailwind directives (@tailwind base/components/utilities) to src/index.css
- Update root .gitignore to exclude frontend/node_modules and build artifacts

Documentation Updates:
- Add CHANGELOG.md entry for Sprint 3 Landing Page development start
- Update README.md with frontend development instructions
- Add Node.js and npm prerequisites
- Document npm commands: install, dev, build, preview

Project Structure:
├── frontend/
│   ├── src/
│   │   ├── App.tsx
│   │   ├── main.tsx
│   │   ├── index.css (with Tailwind)
│   │   └── assets/
│   ├── index.html
│   ├── package.json
│   ├── tailwind.config.js
│   ├── postcss.config.js
│   └── vite.config.ts

Safety First:
- Verified directory doesn't exist before creation
- Checked all configuration files are valid
- Excluded node_modules from git
- No project code modified, only new frontend directory added

Refs: docs/frontend_landing_plan.md
Next: Start developing landing page components

frontend/tsconfig.node.json

@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "types": ["node"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["vite.config.ts"]
+}