feat: WAN IP Guard - dynamic DNS updater with WhatsApp notifications

Checks public WAN IP every 5 minutes via systemd timer. On change:
- Updates A-records via DirectAdmin API (login key auth)
- Sends WhatsApp notification via wwebjs-api

package.json

@@ -0,0 +1,15 @@
+{
+  "name": "wan-ip-guard",
+  "version": "1.0.0",
+  "description": "Monitors WAN IP changes and updates DNS records + sends WhatsApp notification",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "dependencies": {
+    "dotenv": "^16.4.5"
+  },
+  "engines": {
+    "node": ">=18"
+  }
+}