Prepare durable isolated Vergabe pilot deployment and recovery

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a07ff8-19d0-7820-b4d0-1353833cb7fc

helm/vergabe-teilnahme-pilot-values.example.yaml

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+# Review-only template. Copy into the exact admitted company binding, fill the
+# tested image digest/host/Secret, and use a dedicated namespace and database.
+# This does not upgrade or reuse the historical vergabe_db installation.
+pilot:
+  enabled: true
+image:
+  digest: ""   # Required; the old published image lacks the pilot access gate.
+replicaCount: 1
+envSecretName: vergabe-pilot-env
+env:
+  DJANGO_SETTINGS_MODULE: vergabe_teilnahme.settings.prod
+  ALLOWED_HOSTS: pilot.example.invalid,localhost
+  CSRF_TRUSTED_ORIGINS: https://pilot.example.invalid
+probes:
+  hostHeader: pilot.example.invalid
+persistence:
+  media:
+    enabled: true
+  appState:
+    enabled: true