chore(backend): add ESLint and Prettier configuration

eme-backend/package.json

@@ -11,21 +11,31 @@
     "prisma:migrate": "prisma migrate dev",
     "prisma:studio": "prisma studio",
     "seed": "ts-node prisma/seed.ts",
-    "fixtures": "ts-node prisma/fixtures.ts"
+    "fixtures": "ts-node prisma/fixtures.ts",
+    "lint": "eslint .",
+    "lint:fix": "eslint . --fix",
+    "format": "prettier --write \"src/**/*.ts\" \"prisma/**/*.ts\"",
+    "format:check": "prettier --check \"src/**/*.ts\" \"prisma/**/*.ts\""
   },
   "keywords": [],
   "author": "",
   "license": "ISC",
   "type": "commonjs",
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@types/cors": "^2.8.19",
     "@types/express": "^5.0.6",
     "@types/jsonwebtoken": "^9.0.10",
     "@types/node": "^25.9.1",
+    "eslint": "^10.5.0",
+    "eslint-config-prettier": "^10.1.8",
+    "globals": "^17.6.0",
     "nodemon": "^3.1.14",
+    "prettier": "^3.8.4",
     "prisma": "^7.8.0",
     "ts-node": "^10.9.2",
-    "typescript": "^6.0.3"
+    "typescript": "^6.0.3",
+    "typescript-eslint": "^8.61.1"
   },
   "dependencies": {
     "@prisma/adapter-mssql": "^7.8.0",