fix(ha): scale all CNPG clusters to 3 replicas, raise overprovisioning to 200%

- authentik-db: 2 → 3 instances
- gotify-db: 1 → 3 instances
- longhorn storageOverProvisioningPercentage: 100 → 200
  (actual disk usage ~44/474 GB on cp-1; thin provisioning is safe)
  Unblocks 3rd Longhorn replica scheduling on cp-1 which had DiskPressure

k8s/apps/gotify/db.yaml

@@ -8,7 +8,7 @@ metadata:
   annotations:
     argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true
 spec:
-  instances: 1
+  instances: 3
   imageName: ghcr.io/cloudnative-pg/postgresql:16.2
   bootstrap:
     initdb:

k8s/bootstrap/phase1-storage/longhorn-values.yaml

@@ -12,6 +12,7 @@ defaultSettings:
   replicaSoftAntiAffinity: false  # REQUIRED for true HA
   replicaAutoBalance: best-effort
   storageMinimalAvailablePercentage: 10
+  storageOverProvisioningPercentage: 200  # Actual usage is ~10% of scheduled; 200% unblocks all 3-replica scheduling on cp-1
   
   # Performance tuning
   defaultDataPath: /var/lib/longhorn

k8s/infra/databases/authentik-db.yaml

@@ -9,7 +9,7 @@ metadata:
   annotations:
     argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true
 spec:
-  instances: 2
+  instances: 3
   imageName: ghcr.io/cloudnative-pg/postgresql:16.2
   bootstrap:
     initdb: