chore(backend): add ESLint and Prettier configuration

eme-backend/.prettierignore

@@ -0,0 +1,3 @@
+dist
+node_modules
+prisma/migrations

eme-backend/.prettierrc.json

@@ -0,0 +1,7 @@
+{
+  "singleQuote": true,
+  "semi": true,
+  "printWidth": 100,
+  "tabWidth": 2,
+  "trailingComma": "all"
+}

eme-backend/eslint.config.mjs

@@ -0,0 +1,26 @@
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
+
+export default tseslint.config(
+  {
+    ignores: ['dist/**', 'node_modules/**', 'prisma/migrations/**'],
+  },
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+  prettier,
+  {
+    languageOptions: {
+      globals: { ...globals.node },
+    },
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'error',
+      '@typescript-eslint/no-non-null-assertion': 'error',
+      '@typescript-eslint/explicit-module-boundary-types': 'error',
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }],
+      'prefer-const': 'error',
+      'no-console': 'off',
+    },
+  },
+);

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",