feat(wiki): deploy Wiki.js in the suite (#0048) — waits on the DB secret

Wiki.js + a dedicated Postgres + public ingress for wiki.axion1337.chat, added to
the production kustomization so Flux applies it. Both pods intentionally wait on
the SOPS secret `wikijs-postgres-secret` (username/password) until sorb creates it
— same loud-but-visible pattern as the concierge bot. NetworkPolicy: Traefik ->
wikijs:http, wikijs -> wikijs-postgres:postgres (ingress-only, named container
ports). Ingress/Cert mirror the authentik pattern (letsencrypt-prod). Native OIDC
login (#0049, guide 10) and git-storage are configured post-start. All manifests
validated server-side (kubectl --dry-run=server).

apps/production/wikijs.yaml

@@ -0,0 +1,88 @@
+# Wiki.js — Plattform-Wiki (ADR-0014, #0048). Öffentlich unter wiki.axion1337.chat
+# (Ingress/Cert in wiki-ingress.yaml), Login nativ via Authentik-OIDC (#0049, Guide 10).
+# Git-Storage (Inhalt in git) wird nach dem ersten Start in der Admin-UI eingerichtet.
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: wikijs-data
+  namespace: matrix
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: local-path
+  resources:
+    requests:
+      storage: 2Gi
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: wikijs
+  namespace: matrix
+spec:
+  replicas: 1
+  strategy:
+    type: Recreate          # RWO-Volume (Git-Storage-Klon)
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: wikijs
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: wikijs
+    spec:
+      containers:
+        - name: wikijs
+          image: ghcr.io/requarks/wiki:2.5
+          ports:
+            - name: http
+              containerPort: 3000
+          env:
+            - name: DB_TYPE
+              value: postgres
+            - name: DB_HOST
+              value: wikijs-postgres
+            - name: DB_PORT
+              value: "5432"
+            - name: DB_NAME
+              value: wiki
+            - name: DB_USER
+              valueFrom:
+                secretKeyRef:
+                  name: wikijs-postgres-secret
+                  key: username
+            - name: DB_PASS
+              valueFrom:
+                secretKeyRef:
+                  name: wikijs-postgres-secret
+                  key: password
+          volumeMounts:
+            - name: data
+              mountPath: /wiki/data
+          readinessProbe:
+            tcpSocket:
+              port: http
+            initialDelaySeconds: 25
+            periodSeconds: 10
+          livenessProbe:
+            tcpSocket:
+              port: http
+            initialDelaySeconds: 60
+            periodSeconds: 20
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: wikijs-data
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: wikijs
+  namespace: matrix
+spec:
+  selector:
+    app.kubernetes.io/name: wikijs
+  ports:
+    - name: http
+      port: 3000
+      targetPort: http