Update Dockerfile and package.json to include environment variables, expose port, and add server entry point; add server implementation in src/server.ts with health check and greeting endpoint.

package.json

@@ -8,7 +8,9 @@
   "scripts": {
     "clean": "rimraf dist",
     "build": "npm run clean && tsc -p tsconfig.json",
-    "test": "vitest run"
+    "test": "vitest run",
+    "start": "node dist/server.js",
+    "dev": "tsx watch src/server.ts"
   },
   "files": [
     "dist",
@@ -17,6 +19,22 @@
   "engines": {
     "node": ">=20"
   },
-  "license": "MIT"
+  "license": "MIT",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.19.2",
+    "helmet": "^7.1.0",
+    "morgan": "^1.10.0"
+  },
+  "devDependencies": {
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.21",
+    "@types/morgan": "^1.9.7",
+    "@types/node": "^20.14.12",
+    "rimraf": "^5.0.7",
+    "tsx": "^4.19.1",
+    "typescript": "^5.5.4",
+    "vitest": "^1.6.0"
+  }
 }