Cейчас точно заработает

docker/nginx/conf.d/default.conf

@@ -2,35 +2,21 @@ server {
     listen 80;
     server_name localhost;
 
-    root /usr/share/nginx/html;
-    index index.html;
-
-    # Основной маршрут для статических файлов
     location / {
-        try_files $uri $uri/ /index.html;
-        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        proxy_pass http://frontend;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
     }
 
-    # Маршрут для админ-панели
-    location /admin {
-        alias /usr/share/nginx/html;
-        try_files $uri $uri/ /index.html;
-        add_header Cache-Control "no-cache, no-store, must-revalidate";
-    }
-
-    # API прокси
     location /api/ {
-        proxy_pass http://backend:8000/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;
-        proxy_connect_timeout 60s;
-        proxy_send_timeout 60s;
-        proxy_read_timeout 60s;
     }
-
-    # Обработка ошибок
-    error_page 404 /index.html;
 }