Add reverse proxy for /api/ to backend in nginx config

Configured a new location block in `nginx.conf` to forward requests from `/api/` to the backend service running on port 8000. This includes necessary headers and settings to handle the proxied requests properly.

frontend/nginx.conf

@@ -5,6 +5,15 @@ server {
   root /usr/share/nginx/html;
   index index.html;
 
+  location /api/ {
+    proxy_pass http://backend:8000;
+    proxy_http_version 1.1;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+  }
+
   location / {
     try_files $uri $uri/ /index.html;
   }