refactor: remove old ecosystem configuration files and replace with JSON format

frontend/ecosystem.config.js

@@ -1,15 +0,0 @@
-module.exports = {
-  apps: [{
-    name: 'portfolio-frontend',  // A name for your application in PM2
-    script: 'npm',               // Tell PM2 to run an npm command
-    args: 'start',               // The argument to pass to npm, which runs 'next start'
-    cwd: `${process.env.DEPLOY_PATH}/frontend`, // Current working directory for the script
-    instances: 1,                // Run a single instance of the application
-    autorestart: true,           // Automatically restart if the app crashes
-    watch: false,                // Do NOT watch for file changes in production
-    max_memory_restart: '512M',  // Restart if it uses more than 512MB of RAM
-    env: {
-      NODE_ENV: 'production',    // Set the environment to production
-    }
-  }]
-};

frontend/ecosystem.config.json

@@ -0,0 +1,13 @@
+{
+  "apps": [{
+    "name": "portfolio-frontend",
+    "script": "npm",
+    "args": "start",
+    "instances": 1,
+    "autorestart": true,
+    "watch": false,
+    "env": {
+      "NODE_ENV": "production"
+    }
+  }]
+}