fix(pretix): increase memory limit to 6Gi; eventyay nginx sidecar; crowdsec middleware

pretix/standalone runs gunicorn + celery + celery-beat in one container
and OOMKilled at 4Gi. Increased limit to 6Gi, request to 512Mi.

eventyay: add nginx sidecar to serve static files, update health probes
to check a static asset at port 8080, add create-superuser script,
register script in manifest.

crowdsec: middleware fix (previously uncommitted).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pretix/versions/2026/deployment.yaml

@@ -78,11 +78,11 @@ spec:
             limits:
               cpu: "2"
               ephemeral-storage: 1Gi
-              memory: 4Gi
+              memory: 6Gi
             requests:
               cpu: 50m
               ephemeral-storage: 50Mi
-              memory: 256Mi
+              memory: 512Mi
           volumeMounts:
             - name: pretix-data
               mountPath: /data