feat: add paperless-ngx with OIDC, CNPG db, cp-3 HDD media, MinIO backup

Fixes controlplane.tftpl's install.wipe:true (should be false, live CPs already run false) and syncs coredns Corefile back to what's actually deployed (drops an unrolled-out, stale Kong-era rewrite).

k8s/apps/paperless/pvc.yaml

@@ -0,0 +1,33 @@
+# Two volumes, deliberately separate storage classes:
+#
+# - media: the actual documents (originals + OCR'd archive PDFs + thumbnails).
+#   Grows to multi-TB, lives on the cp-3 USB HDD, single replica (see
+#   k8s/infra/longhorn/longhorn-paperless-storageclass.yaml). Sized 3500Gi to
+#   leave headroom on the 4TB disk rather than claiming it to 100%.
+# - data: the SQLite classification model + search index. Small (low GB),
+#   frequently rewritten, and disposable (rebuilds from the DB + media on
+#   next consume) - stays on the default 3-replica pool instead of the
+#   single-disk HDD.
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: paperless-media
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: longhorn-paperless-media
+  resources:
+    requests:
+      storage: 3500Gi
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: paperless-data
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: longhorn
+  resources:
+    requests:
+      storage: 5Gi