refactor: change backend to typescript and update types and variables accordingly

package.json

@@ -3,7 +3,8 @@
   "private": true,
   "workspaces": [
     "backend",
-    "frontend"
+    "frontend",
+    "shared"
   ],
   "version": "0.1.0-dev",
   "description": "![React](https://img.shields.io/badge/React-61DAFB?logo=react&logoColor=000&style=flat) ![TypeScript](https://img.shields.io/badge/TypeScript-3178C6?logo=typescript&logoColor=fff&style=flat) ![Vite](https://img.shields.io/badge/Vite-646CFF?logo=vite&logoColor=fff&style=flat) ![Tailwind%20CSS](https://img.shields.io/badge/Tailwind%20CSS-38B2AC?logo=tailwindcss&logoColor=fff&style=flat) ![MUI](https://img.shields.io/badge/MUI-007FFF?logo=mui&logoColor=fff&style=flat) ![TanStack%20Query](https://img.shields.io/badge/TanStack%20Query-FF4154?logo=reactquery&logoColor=fff&style=flat) ![React%20Router](https://img.shields.io/badge/React%20Router-CA4245?logo=reactrouter&logoColor=fff&style=flat) [![TanStack%20Form](https://img.shields.io/badge/TanStack%20Form-EC5990?logo=reacthookform&logoColor=fff)](#) ![Node.js](https://img.shields.io/badge/Node.js-339933?logo=nodedotjs&logoColor=fff&style=flat) ![Express](https://img.shields.io/badge/Express-000000?logo=express&logoColor=fff&style=flat) ![MySQL](https://img.shields.io/badge/MySQL-4479A1?logo=mysql&logoColor=fff&style=flat) ![Docker](https://img.shields.io/badge/Docker-2496ED?logo=docker&logoColor=fff&style=flat) ![Nginx](https://img.shields.io/badge/Nginx-009639?logo=nginx&logoColor=fff&style=flat)",
@@ -13,7 +14,8 @@
     "dev:backend": "npm run dev --workspace=backend",
     "dev:docker": "docker compose -f docker-compose.dev.yml up -d --wait",
     "dev": "npm run dev:docker && concurrently --kill-others \"npm:dev:frontend\" \"npm:dev:backend\"",
-    "dev:stop": "docker compose -f docker-compose.dev.yml down"
+    "dev:stop": "docker compose -f docker-compose.dev.yml down",
+    "buildProd": ""
   },
   "repository": {
     "type": "git",
@@ -24,6 +26,9 @@
   "license": "ISC",
   "type": "commonjs",
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
+    "@types/cors": "^2.8.19",
+    "@types/express": "^5.0.6",
     "concurrently": "^10.0.3"
   }
 }