Add DevSecOpsApp code with updated Jenkins pipeline for multi-environment deployment

backend/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "todo-backend",
+  "version": "1.0.0",
+  "description": "Simple Backend API for Todo Application",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node server.js",
+    "test": "echo \"No tests specified\" && exit 0",
+    "build": "echo \"Backend build completed\" && exit 0",
+    "lint": "echo \"Linting not configured yet\" && exit 0",
+    "security": "npm audit --audit-level=high"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "cors": "^2.8.5",
+    "dotenv": "^16.3.1"
+  },
+  "keywords": ["todo", "api", "express"],
+  "author": "DevOps Learner",
+  "license": "MIT"
+}