chore(init): project setup with Docker support

backend/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "backend",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "dev": "nodemon index.js",
+    "start": "eslint . && node index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "eslint": "^8.57.1",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-plugin-import": "^2.32.0",
+    "ws": "^8.18.3"
+  },
+  "devDependencies": {
+    "prettier": "^3.6.2"
+  }
+}