feat(ory): replace hardcoded DSN + secrets with OpenBao DB engine + VSO

All Ory service credentials now flow from OpenBao through VSO instead
of being hardcoded in Helm values or Deployment env vars.

Kratos:
- Remove config.dsn; flip secret.enabled=false with nameOverride pointing
  at kratos-app-secrets (a VSO-managed Secret with secretsDefault,
  secretsCookie, smtpConnectionURI).
- Inject DSN at runtime via deployment.extraEnv from kratos-db-creds
  (VaultDynamicSecret backed by OpenBao database static role, 24h rotation).

Hydra:
- Remove config.dsn; inject DSN via deployment.extraEnv from hydra-db-creds
  (VaultDynamicSecret, same rotation scheme).

Login UI:
- Replace hardcoded COOKIE_SECRET/CSRF_COOKIE_SECRET env var values with
  secretKeyRef reads from login-ui-secrets (VaultStaticSecret → secret/login-ui).

vault-secrets.yaml adds: VaultAuth, Hydra VSS, kratos-app-secrets VSS,
login-ui-secrets VSS, kratos-db-creds VDS, hydra-db-creds VDS.

base/ory/vault-secrets.yaml

@@ -0,0 +1,138 @@
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultAuth
+metadata:
+  name: vso-auth
+  namespace: ory
+spec:
+  method: kubernetes
+  mount: kubernetes
+  kubernetes:
+    role: vso
+    serviceAccount: default
+---
+# Hydra app secrets (non-rotating). DSN comes from VaultDynamicSecret hydra-db-creds.
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: hydra
+  namespace: ory
+spec:
+  vaultAuthRef: vso-auth
+  mount: secret
+  type: kv-v2
+  path: hydra
+  refreshAfter: 30s
+  destination:
+    name: hydra
+    create: true
+    overwrite: true
+    transformation:
+      excludeRaw: true
+      templates:
+        secretsSystem:
+          text: "{{ index .Secrets \"system-secret\" }}"
+        secretsCookie:
+          text: "{{ index .Secrets \"cookie-secret\" }}"
+        "pairwise-salt":
+          text: "{{ index .Secrets \"pairwise-salt\" }}"
+---
+# Kratos non-rotating encryption keys. DSN comes from VaultDynamicSecret kratos-db-creds.
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: kratos-app-secrets
+  namespace: ory
+spec:
+  vaultAuthRef: vso-auth
+  mount: secret
+  type: kv-v2
+  path: kratos
+  refreshAfter: 30s
+  destination:
+    name: kratos-app-secrets
+    create: true
+    overwrite: true
+    transformation:
+      excludeRaw: true
+      templates:
+        secretsDefault:
+          text: "{{ index .Secrets \"secrets-default\" }}"
+        secretsCookie:
+          text: "{{ index .Secrets \"secrets-cookie\" }}"
+        smtpConnectionURI:
+          text: "{{ index .Secrets \"smtp-connection-uri\" }}"
+---
+# Kratos DB credentials from OpenBao database secrets engine (static role, 24h rotation).
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultDynamicSecret
+metadata:
+  name: kratos-db-creds
+  namespace: ory
+spec:
+  vaultAuthRef: vso-auth
+  mount: database
+  path: static-creds/kratos
+  refreshAfter: 1h
+  rolloutRestartTargets:
+    - kind: Deployment
+      name: kratos
+    - kind: StatefulSet
+      name: kratos-courier
+  destination:
+    name: kratos-db-creds
+    create: true
+    overwrite: true
+    transformation:
+      excludeRaw: true
+      templates:
+        dsn:
+          text: "postgresql://{{ index .Secrets \"username\" }}:{{ index .Secrets \"password\" }}@postgres-rw.data.svc.cluster.local:5432/kratos_db?sslmode=disable"
+---
+# Login UI session cookie + CSRF protection secrets.
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultStaticSecret
+metadata:
+  name: login-ui-secrets
+  namespace: ory
+spec:
+  vaultAuthRef: vso-auth
+  mount: secret
+  type: kv-v2
+  path: login-ui
+  refreshAfter: 30s
+  destination:
+    name: login-ui-secrets
+    create: true
+    overwrite: true
+    transformation:
+      excludeRaw: true
+      templates:
+        cookie-secret:
+          text: "{{ index .Secrets \"cookie-secret\" }}"
+        csrf-cookie-secret:
+          text: "{{ index .Secrets \"csrf-cookie-secret\" }}"
+---
+# Hydra DB credentials from OpenBao database secrets engine (static role, 24h rotation).
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultDynamicSecret
+metadata:
+  name: hydra-db-creds
+  namespace: ory
+spec:
+  vaultAuthRef: vso-auth
+  mount: database
+  path: static-creds/hydra
+  refreshAfter: 1h
+  rolloutRestartTargets:
+    - kind: Deployment
+      name: hydra
+  destination:
+    name: hydra-db-creds
+    create: true
+    overwrite: true
+    transformation:
+      excludeRaw: true
+      templates:
+        dsn:
+          text: "postgresql://{{ index .Secrets \"username\" }}:{{ index .Secrets \"password\" }}@postgres-rw.data.svc.cluster.local:5432/hydra_db?sslmode=disable"