feat: Implement the core InterNetX DDNS updater application with API, services, middleware, Docker support, and a detailed README.

package.json

@@ -0,0 +1,45 @@
+{
+    "name": "internetx-ddns-updater",
+    "version": "1.0.0",
+    "description": "DDNS Bridge for InterNetX AutoDNS - Update DNS records via router requests",
+    "main": "src/index.js",
+    "scripts": {
+        "start": "node src/index.js",
+        "dev": "nodemon src/index.js",
+        "test": "jest --coverage",
+        "test:watch": "jest --watch",
+        "lint": "eslint src/**/*.js"
+    },
+    "keywords": [
+        "ddns",
+        "internetx",
+        "autodns",
+        "dns",
+        "router",
+        "draytek"
+    ],
+    "author": "Netstack GmbH",
+    "license": "MIT",
+    "dependencies": {
+        "dotenv": "^16.3.1",
+        "express": "^4.18.2",
+        "express-rate-limit": "^7.1.5",
+        "helmet": "^7.1.0",
+        "joi": "^17.11.0",
+        "js-domainrobot-sdk": "^2.1.17",
+        "winston": "^3.11.0",
+        "winston-daily-rotate-file": "^4.7.1"
+    },
+    "devDependencies": {
+        "eslint": "^8.56.0",
+        "jest": "^29.7.0",
+        "nodemon": "^3.0.2"
+    },
+    "overrides": {
+        "axios": "^1.7.9"
+    },
+    "engines": {
+        "node": ">=24.0.0",
+        "npm": ">=10.0.0"
+    }
+}