Increase nginx client_max_body_size to 50M to fix 413 Request Entity Too Large error for banner uploads

nginx.conf

@@ -17,6 +17,9 @@ server {
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
 
+        # Allow larger file uploads (50MB)
+        client_max_body_size 50M;
+
         # If backend is unavailable, serve mock data
         error_page 502 503 504 = @fallback;
     }