Add backend and frontend structure with routing, components, and styling

- Implemented Express server with CORS and dotenv support
- Created basic routing with React Router in frontend
- Added Admin and Home components with navigation
- Integrated MainForm component for user input
- Updated package.json and package-lock.json with new dependencies
- Styled components using Tailwind CSS and Lucide icons
- Added error handling in server
- Created initial EJS view for backend

backend/package.json

@@ -11,6 +11,8 @@
   "license": "ISC",
   "description": "",
   "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^17.2.1",
     "express": "^5.1.0"
   }
 }