Add Node.js Hello World application with Docker support

- Added index.js: Simple HTTP server on port 3000
- Added package.json: NPM configuration
- Added Dockerfile: Multi-stage Docker build
- Added .dockerignore: Exclude unnecessary files from build

Ready for Coolify deployment via CI/CD pipeline.

index.js

@@ -0,0 +1,13 @@
+const http = require('http');
+
+const PORT = process.env.PORT || 3000;
+
+const server = http.createServer((req, res) => {
+  res.writeHead(200, { 'Content-Type': 'text/plain' });
+  res.end('Hello World from First Contact! 🚀\n');
+});
+
+server.listen(PORT, '0.0.0.0', () => {
+  console.log(`Server running on port ${PORT}`);
+  console.log(`First Contact application ready!`);
+});