chore(frontend): nginx template with /v2 registry proxy (stream body, timeouts)

Author: troke12

frontend/nginx.conf.template

@@ -28,16 +28,19 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
     }
 
-    # Docker registry API proxy
+    # Docker registry API proxy (stream large PATCH bodies, long timeouts)
     location /v2 {
         proxy_pass ${BACKEND_UPSTREAM};
         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;
         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;
+        # Stream request body to backend instead of buffering (avoids retry on server-to-server push)
+        proxy_request_buffering off;
+        client_max_body_size 0;
+        proxy_connect_timeout 900s;
+        proxy_send_timeout 900s;
+        proxy_read_timeout 900s;
     }
 }