Fix production auth by proxying /api to backend in remote builds.

Remote frontend nginx now forwards API requests to Django so login and registration work when the host proxy only routes to port 8080.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/Dockerfile.prod

@@ -16,7 +16,14 @@ RUN npm run build
 
 FROM nginx:1.27-alpine AS runtime
 
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+ARG VITE_DATA_MODE=local
+COPY nginx.conf /tmp/nginx.local.conf
+COPY nginx.remote.conf /tmp/nginx.remote.conf
+RUN if [ "$VITE_DATA_MODE" = "remote" ]; then \
+      cp /tmp/nginx.remote.conf /etc/nginx/conf.d/default.conf; \
+    else \
+      cp /tmp/nginx.local.conf /etc/nginx/conf.d/default.conf; \
+    fi
 COPY --from=build /app/dist /usr/share/nginx/html
 
 EXPOSE 80

frontend/nginx.remote.conf

@@ -0,0 +1,32 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_types text/css application/javascript application/json image/svg+xml;
+
+    # API → Django backend (контейнер backend в docker-compose)
+    location /api/ {
+        proxy_pass http://backend:8000/api/;
+        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 10s;
+        proxy_read_timeout 120s;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
+        expires 7d;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+}

frontend/src/lib/api/errors.js

@@ -1,6 +1,14 @@
 export function formatApiErrorData(data) {
   if (!data) return ''
-  if (typeof data === 'string' && data.trim()) return data.trim()
+  if (typeof data === 'string' && data.trim()) {
+    const text = data.trim()
+    if (text.startsWith('<') && text.includes('</html>')) {
+      const title = text.match(/<title>([^<]+)<\/title>/i)?.[1]?.trim()
+      if (title) return title
+      return 'Сервер вернул HTML вместо JSON. Проверьте проксирование /api на backend.'
+    }
+    return text
+  }
   if (typeof data?.detail === 'string' && data.detail.trim()) return data.detail.trim()
   if (Array.isArray(data?.non_field_errors) && data.non_field_errors.length) {
     return data.non_field_errors.join('; ')