refactor(api): update server configuration for Docker

- Configure server to listen on all interfaces (0.0.0.0)
- Add fallback port 5000 for development
- Improve logging for container startup

api/src/server.ts

@@ -3,8 +3,8 @@ import dotenv from 'dotenv';
 
 dotenv.config();
 
-const PORT = process.env.PORT || 5000;
+const PORT = parseInt(process.env.PORT || '5000', 10);
 
-app.listen(PORT, () => {
+app.listen(PORT, '0.0.0.0', () => {
     console.log(`API running on port ${PORT}`);
 });