fix(gotify): remove configuration-snippet annotation blocking nginx ingress

nginx-ingress v1.15.1 blocks configuration-snippet by default as a
security risk, silently dropping the entire Ingress resource. WebSocket
upgrade headers are handled natively with proxy-http-version 1.1.

k8s/apps/gotify/ingress.yaml

@@ -6,11 +6,9 @@ metadata:
   annotations:
     nginx.ingress.kubernetes.io/proxy-read-timeout: "600"
     nginx.ingress.kubernetes.io/proxy-send-timeout: "600"
-    # WebSocket support for Gotify client connections
+    # WebSocket support for Gotify client connections (/stream endpoint)
+    # nginx-ingress handles Upgrade/Connection headers natively with http/1.1
     nginx.ingress.kubernetes.io/proxy-http-version: "1.1"
-    nginx.ingress.kubernetes.io/configuration-snippet: |
-      proxy_set_header Upgrade $http_upgrade;
-      proxy_set_header Connection "upgrade";
 spec:
   ingressClassName: nginx
   rules: