Add Docker configuration for deployment and fix Supabase types for contacts table

nginx.conf

@@ -37,7 +37,7 @@ http {
 
         # Proxy API requests to the backend server
         location /api/ {
-            proxy_pass http://localhost:3001/;
+            proxy_pass http://backend:3001/;
             proxy_http_version 1.1;
             proxy_set_header Upgrade $http_upgrade;
             proxy_set_header Connection 'upgrade';